{"id":999,"date":"2026-04-24T10:19:54","date_gmt":"2026-04-24T10:19:54","guid":{"rendered":"https:\/\/77.buffdemo.com\/index.php\/2026\/04\/24\/bo-5-de-toan-tsa-kem-dap-an-de-21-de-25\/"},"modified":"2026-04-24T10:19:54","modified_gmt":"2026-04-24T10:19:54","slug":"bo-5-de-toan-tsa-kem-dap-an-de-21-de-25","status":"publish","type":"post","link":"https:\/\/77.buffdemo.com\/index.php\/2026\/04\/24\/bo-5-de-toan-tsa-kem-dap-an-de-21-de-25\/","title":{"rendered":"B\u1ed9 5 \u0111\u1ec1 to\u00e1n TSA k\u00e8m \u0111\u00e1p \u00e1n \u2013 T\u00fa Khanh (\u0110\u1ec1 21 \u2013 25)"},"content":{"rendered":"<div class=\"entry-content single-page\">\n<p>T\u00e0i li\u1ec7u \u00f4n thi ti\u1ebfp t\u1ee5c chia s\u1ebb B\u1ed9 5 \u0111\u1ec1 To\u00e1n TSA \u2013 \u0110H B\u00e1ch Khoa H\u00e0 N\u1ed9i t\u1eeb \u0110\u1ec1 21 \u0111\u1ebfn \u0110\u1ec1 25 do b\u1ea1n Ph\u1ea1m T\u00fa Khanh bi\u00ean so\u1ea1n.<\/p>\n<div class=\"code-block code-block-2\" style=\"margin: 8px auto; text-align: center; display: block; clear: both;\">\n<div> <\/div>\n<\/div>\n<p>B\u1ed9 \u0111\u1ec1 n\u00e0y l\u00e0 ph\u1ea7n b\u1ed5 sung c\u1ea7n thi\u1ebft cho qu\u00e1 tr\u00ecnh luy\u1ec7n thi, gi\u00fap c\u00e1c b\u1ea1n n\u00e2ng cao k\u1ef9 n\u0103ng v\u00e0 l\u00e0m quen th\u00eam v\u1edbi nhi\u1ec1u d\u1ea1ng b\u00e0i. T\u01b0\u01a1ng t\u1ef1 nh\u01b0 b\u1ed9 tr\u01b0\u1edbc, t\u00e0i li\u1ec7u bao g\u1ed3m \u0111\u1ea7y \u0111\u1ee7 5 \u0111\u1ec1 thi th\u1eed m\u00f4n To\u00e1n TSA (t\u1eeb \u0111\u1ec1 21 t\u1edbi \u0111\u1ec1 25) v\u00e0 c\u00f3 k\u00e8m theo \u0111\u00e1p \u00e1n chi ti\u1ebft.<\/p>\n<h2 class=\"wp-block-heading has-vivid-red-color has-text-color has-link-color wp-elements-55c31ce704a68edf69f2d7cbaa82b682\" id=\"h-t\u1ea3i-b\u1ed9-5-d\u1ec1-toan-tsa-kem-dap-an-tu-khanh-d\u1ec1-21-25\"><span class=\"ez-toc-section\" id=\"Tai_bo_5_de_toan_TSA_kem_dap_an_%E2%80%93_Tu_Khanh_De_21_%E2%80%93_25\"><\/span>T\u1ea3i b\u1ed9 5 \u0111\u1ec1 to\u00e1n TSA k\u00e8m \u0111\u00e1p \u00e1n \u2013 T\u00fa Khanh (\u0110\u1ec1 21 \u2013 25)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>C\u00e1c b\u1ea1n t\u1ea3i t\u00e0i li\u1ec7u \u1edf \u0111\u00e2y nh\u00e9<\/p>\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-white-color has-luminous-vivid-orange-background-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/drive.google.com\/file\/d\/1L0zfblYT15UBcjoEDNbK9sztilcUwZsU\/view\" rel=\"noreferrer noopener nofollow\" target=\"_blank\"><strong>T\u1ea2I B\u1ed8 5 \u0110\u1ec0 TO\u00c1N TSA \u2013 \u0110\u1ec0 21-25<\/strong><\/a><\/div>\n<\/div>\n<p>Tham kh\u1ea3o th\u00eam: <strong><a href=\"https:\/\/tailieuonthi.org\/bo-5-de-toan-tsa-kem-dap-an-tu-khanh-de-16-20\/\" rel=\"noreferrer noopener\" target=\"_blank\">T\u1ea3i b\u1ed9 5 \u0111\u1ec1 to\u00e1n TSA k\u00e8m \u0111\u00e1p \u00e1n \u2013 T\u00fa Khanh (\u0110\u1ec1 16 \u2013 20)<\/a><\/strong><\/p>\n<p><strong>Xem tr\u01b0\u1edbc t\u00e0i li\u1ec7u:<\/strong><\/p>\n<p class=\"has-text-align-center\"><iframe loading=\"lazy\" allow=\"autoplay\" height=\"480\" src=\"https:\/\/drive.google.com\/file\/d\/1L0zfblYT15UBcjoEDNbK9sztilcUwZsU\/preview\" width=\"640\"><\/iframe><\/p>\n<h2 class=\"wp-block-heading has-vivid-red-color has-text-color has-link-color wp-elements-ebee8892143cd975c22d2d4cd023817f\" id=\"h-n\u1ed9i-dung-1-s\u1ed1-cau-h\u1ecfi-b\u1ed9-5-d\u1ec1-toan-h\u1ecdc-tsa-d\u1ec1-21-25\"><span class=\"ez-toc-section\" id=\"Noi_dung_1_so_cau_hoi_bo_5_de_toan_hoc_TSA_De_21_%E2%80%93_25\"><\/span>N\u1ed9i dung 1 s\u1ed1 c\u00e2u h\u1ecfi b\u1ed9 5 \u0111\u1ec1 to\u00e1n h\u1ecdc TSA (\u0110\u1ec1 21 \u2013 25)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>C\u00e2u 3. [M\u1ee9c 1] M\u1ed9t kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng c\u00f3 \u0111\u1ed9 d\u00e0i c\u00e1c c\u1ea1nh b\u1eb1ng b\u1ecb l\u1ea5y m\u1ea5t \u0111i nhi\u1ec1u kh\u1ed1i vu\u00f4ng \u0111\u01a1n v\u1ecb nh\u1ecf c\u00f3 k\u00edch th\u01b0\u1edbc b\u1eb1ng nhau (nh\u01b0 h\u00ecnh v\u1ebd b\u00ean). Khi \u0111\u00f3, c\u1ea7n g\u1eafn l\u1ea1i bao nhi\u00eau kh\u1ed1i vu\u00f4ng \u0111\u01a1n v\u1ecb \u0111\u1ec3 s\u1eeda kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng \u0111\u00e3 cho v\u1ec1 nh\u01b0 ban \u0111\u1ea7u?<\/p>\n<p>C\u00e2u 7. [M\u1ee9c 2] B\u1ea1n H\u1ea3i c\u00f3 ba t\u00fai \u0111\u1ef1ng bi. Trong \u0111\u00f3, s\u1ed1 bi \u1edf t\u00fai th\u1ee9 nh\u1ea5t b\u1eb1ng m\u1ed9t n\u1eeda s\u1ed1 bi \u1edf t\u00fai hai, s\u1ed1 bi trong t\u00fai ba g\u1ea5p ba l\u1ea7n s\u1ed1 bi \u1edf t\u00fai th\u1ee9 nh\u1ea5t. M\u1eb7t kh\u00e1c, m\u1ed9t n\u1eeda s\u1ed1 bi \u1edf t\u00fai m\u1ed9t, m\u1ed9t ph\u1ea7n ba s\u1ed1 bi \u1edf t\u00fai hai v\u00e0 m\u1ed9t ph\u1ea7n t\u01b0 s\u1ed1 bi \u1edf t\u00fai ba c\u00f3 m\u00e0u xanh. H\u1ea3i \u0111\u1ed5 h\u1ebft bi t\u1eeb c\u1ea3 ba t\u00fai v\u00e0o m\u1ed9t chi\u1ebfc h\u1ed9p r\u1ed3i ch\u1ecdn ng\u1eabu nhi\u00ean m\u1ed9t vi\u00ean bi trong h\u1ed9p \u0111\u00f3, x\u00e1c su\u1ea5t \u0111\u1ec3 ch\u1ecdn \u0111\u01b0\u1ee3c vi\u00ean bi m\u00e0u xanh l\u00e0 . Khi \u0111\u00f3, t\u1ed5ng b\u1eb1ng?<\/p>\n<p>C\u00e2u 32. [M\u1ee9c 3] Trong m\u1ed9t d\u1ef1 \u00e1n trang tr\u00ed, c\u00f4 gi\u00e1o ch\u1ee7 nghi\u1ec7m c\u1ee7a l\u1edbp 12A mu\u1ed1n thi\u1ebft k\u1ebf m\u1ed9t m\u00f3n \u0111\u1ed3 ch\u01a1i h\u00ecnh tr\u1ee5 \u0111\u01b0\u1ee3c b\u1ecdc trong l\u1edbp v\u1ecf h\u00ecnh c\u1ea7u, c\u00f3 \u0111\u01b0\u1eddng k\u00ednh b\u1eb1ng , sao cho l\u1edbp v\u1ecf lu\u00f4n ngo\u1ea1i ti\u1ebfp m\u00f3n \u0111\u1ed3 ch\u01a1i. Bi\u1ebft r\u1eb1ng \u0111\u1ed9 d\u00e0y c\u1ee7a l\u1edbp v\u1ecf kh\u00f4ng \u0111\u00e1ng k\u1ec3 v\u00e0 c\u00f4 gi\u00e1o mu\u1ed1n thi\u1ebft k\u1ebf m\u00f3n \u0111\u1ed3 ch\u01a1i sao cho di\u1ec7n t\u00edch xung quanh l\u00e0 l\u1edbn nh\u1ea5t nh\u1eb1m cho h\u1ecdc sinh t\u00f4 m\u00e0u tr\u00e1ng tr\u00ed l\u00ean m\u00f3n \u0111\u1ed3 \u0111\u00f3. X\u00e9t t\u00ednh \u0111\u00fang\/sai c\u1ee7a c\u00e1c m\u1ec7nh \u0111\u1ec1 sau:<\/p>\n<p>C\u00e2u 36. [M\u1ee9c 3] M\u1ed9t \u0111o\u00e0n h\u00e0nh kh\u00e1ch chu\u1ea9n b\u1ecb l\u00ean m\u1ed9t toa t\u00e0u g\u1ed3m toa tr\u1edf kh\u00e1ch. X\u00e1c su\u1ea5t \u0111\u1ec3 ch\u1ec9 c\u00f3 \u0111\u00fang toa c\u00f3 ng\u01b0\u1eddi b\u1eb1ng?<\/p>\n<p>C\u00e2u 10. [M\u1ee9c 1] Trong m\u1ed9t bu\u1ed5i kh\u1ea3o s\u00e1t s\u1ed1 l\u01b0\u1ee3ng sinh vi\u00ean theo ng\u00e0nh K\u1ef9 Thu\u1eadt \u0110\u1ecba V\u1eadt L\u00fd, tr\u01b0\u1eddng \u0110\u1ea1i H\u1ecdc M\u1ecf \u0110\u1ecba Ch\u1ea5t th\u1ed1ng k\u00ea \u0111\u01b0\u1ee3c r\u1eb1ng t\u1ec9 l\u1ec7 gi\u1eefa s\u1ed1 l\u01b0\u1ee3ng sinh vi\u00ean n\u0103m nh\u1ea5t v\u1edbi s\u1ed1 sinh vi\u00ean n\u0103m hai l\u00e0 , t\u1ec9 l\u1ec7 gi\u1eefa s\u1ed1 sinh vi\u00ean n\u0103m hai v\u1edbi s\u1ed1 sinh vi\u00ean n\u0103m ba l\u00e0 v\u00e0 t\u1ec9 l\u1ec7 gi\u1eefa s\u1ed1 sinh vi\u00ean n\u0103m ba v\u1edbi s\u1ed1 sinh vi\u00ean n\u0103m t\u01b0 l\u00e0 . N\u1ebfu c\u00f3 t\u1ed5ng sinh vi\u00ean theo ng\u00e0nh K\u1ef9 Thu\u1eadt \u0110\u1ecba V\u1eadt L\u00fd th\u00ec c\u00f3 bao nhi\u00eau sinh vi\u00ean trong \u0111\u00f3 l\u00e0 n\u0103m nh\u1ea5t?<\/p>\n<p><strong>C\u00e2u 23. [M\u1ee9c 3]<\/strong> Cho \u0111\u01b0\u1eddng tr\u00f2n <img loading=\"lazy\" decoding=\"async\" alt=\"(C_1)\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"19\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-1c7d8b703ebb3a9cbc0fad9c225c9738_l3.png\" style=\"vertical-align: -5px;\" title=\"Rendered by QuickLaTeX.com\" width=\"32\"\/> c\u00f3 t\u00e2m <img loading=\"lazy\" decoding=\"async\" alt=\"I_1\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"15\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-8661e3c65497a5b46a26c9396580041e_l3.png\" style=\"vertical-align: -3px;\" title=\"Rendered by QuickLaTeX.com\" width=\"14\"\/>, b\u00e1n k\u00ednh <img loading=\"lazy\" decoding=\"async\" alt=\"r=86\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"12\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-b3d4af850c4b2cc60a6de8db486dbd52_l3.png\" style=\"vertical-align: 0px;\" title=\"Rendered by QuickLaTeX.com\" width=\"50\"\/> v\u00e0 m\u1ed9t \u0111i\u1ec3m A n\u1eb1m tr\u00ean <img loading=\"lazy\" decoding=\"async\" alt=\"(C_1)\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"19\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-1c7d8b703ebb3a9cbc0fad9c225c9738_l3.png\" style=\"vertical-align: -5px;\" title=\"Rendered by QuickLaTeX.com\" width=\"32\"\/>. \u0110\u01b0\u1eddng tr\u00f2n <img loading=\"lazy\" decoding=\"async\" alt=\"(C_2)\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"19\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-832ef39da14516a3afa84daab6ecfcb1_l3.png\" style=\"vertical-align: -5px;\" title=\"Rendered by QuickLaTeX.com\" width=\"32\"\/> c\u00f3 t\u00e2m <img loading=\"lazy\" decoding=\"async\" alt=\"I_2\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"15\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-742612c4f1f421f3ba8d967884955c7f_l3.png\" style=\"vertical-align: -3px;\" title=\"Rendered by QuickLaTeX.com\" width=\"15\"\/> v\u00e0 \u0111\u01b0\u1eddng k\u00ednh <img loading=\"lazy\" decoding=\"async\" alt=\"AI_1\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"16\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-67bb3ee24013e397093392b27d0d1f50_l3.png\" style=\"vertical-align: -3px;\" title=\"Rendered by QuickLaTeX.com\" width=\"27\"\/>, \u0111\u01b0\u1eddng tr\u00f2n <img loading=\"lazy\" decoding=\"async\" alt=\"(C_3)\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"19\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-ed5b4ecc249f9bf18dd91e55fc837602_l3.png\" style=\"vertical-align: -5px;\" title=\"Rendered by QuickLaTeX.com\" width=\"32\"\/> c\u00f3 t\u00e2m <img loading=\"lazy\" decoding=\"async\" alt=\"I_3\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"15\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-60d373165972d380928736d4a560da52_l3.png\" style=\"vertical-align: -3px;\" title=\"Rendered by QuickLaTeX.com\" width=\"15\"\/> v\u00e0 \u0111\u01b0\u1eddng k\u00ednh <img loading=\"lazy\" decoding=\"async\" alt=\"AI_2\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"16\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-9cad9c2d429c9a2c8cbf9f62629b5e18_l3.png\" style=\"vertical-align: -3px;\" title=\"Rendered by QuickLaTeX.com\" width=\"28\"\/>,\u2026 qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u01b0\u1ee3c l\u1eb7p l\u1ea1i v\u00f4 t\u1eadn sao cho \u0111\u01b0\u1eddng tr\u00f2n <img loading=\"lazy\" decoding=\"async\" alt=\"(C_n)\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"19\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-46e9dd83f0d7849f99db64118c7eecf3_l3.png\" style=\"vertical-align: -5px;\" title=\"Rendered by QuickLaTeX.com\" width=\"34\"\/> c\u00f3 t\u00e2m <img loading=\"lazy\" decoding=\"async\" alt=\"I_n\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"15\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-6611f43ae9059f12d15db33c34a2aa79_l3.png\" style=\"vertical-align: -3px;\" title=\"Rendered by QuickLaTeX.com\" width=\"16\"\/> v\u00e0 \u0111\u01b0\u1eddng k\u00ednh <img loading=\"lazy\" decoding=\"async\" alt=\"AI_{n-1}\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"16\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-ae2becf329c7c543343b6395c8c0a515_l3.png\" style=\"vertical-align: -3px;\" title=\"Rendered by QuickLaTeX.com\" width=\"46\"\/>. \u0110\u1eb7t <img loading=\"lazy\" decoding=\"async\" alt=\"S_n\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"15\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-56cc0fc6214899e7072d47c0d504cf8e_l3.png\" style=\"vertical-align: -3px;\" title=\"Rendered by QuickLaTeX.com\" width=\"19\"\/> l\u00e0 di\u1ec7n t\u00edch tam gi\u00e1c \u0111\u1ec1u n\u1ed9i ti\u1ebfp \u0111\u01b0\u1eddng tr\u00f2n <img loading=\"lazy\" decoding=\"async\" alt=\"(C_n)\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"19\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-46e9dd83f0d7849f99db64118c7eecf3_l3.png\" style=\"vertical-align: -5px;\" title=\"Rendered by QuickLaTeX.com\" width=\"34\"\/>, khi \u0111\u00f3 t\u1ed5ng sau b\u1eb1ng bao nhi\u00eau?[ \\lim_{n \\to +\\infty} \\sum_{k=1}^{n} S_k ]<strong>A.<\/strong> <img loading=\"lazy\" decoding=\"async\" alt=\"66564\\sqrt{3}\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"18\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-00b6474c70b1a69997e638dfd872e063_l3.png\" style=\"vertical-align: -2px;\" title=\"Rendered by QuickLaTeX.com\" width=\"68\"\/><br \/><strong>B.<\/strong> <img loading=\"lazy\" decoding=\"async\" alt=\"7396\\sqrt{3}\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"18\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-da87d13fe21b357dd343632c656ba98a_l3.png\" style=\"vertical-align: -2px;\" title=\"Rendered by QuickLaTeX.com\" width=\"59\"\/><br \/><strong>C.<\/strong> <img loading=\"lazy\" decoding=\"async\" alt=\"29584\\sqrt{3}\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"18\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-992181e206ff7719eef0224569e37d3e_l3.png\" style=\"vertical-align: -2px;\" title=\"Rendered by QuickLaTeX.com\" width=\"68\"\/><br \/><strong>D.<\/strong> <img loading=\"lazy\" decoding=\"async\" alt=\"29584\\sqrt{3}\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"18\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-992181e206ff7719eef0224569e37d3e_l3.png\" style=\"vertical-align: -2px;\" title=\"Rendered by QuickLaTeX.com\" width=\"68\"\/><\/p>\n<p><strong>C\u00e2u 24. [M\u1ee9c 3]<\/strong> Bi\u1ebft r\u1eb1ng khi chia s\u1ed1 <img loading=\"lazy\" decoding=\"async\" alt=\"111\\dots111\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"12\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-db276448e8ab3fdc37ab14fe37a728fd_l3.png\" style=\"vertical-align: 0px;\" title=\"Rendered by QuickLaTeX.com\" width=\"78\"\/> (g\u1ed3m 2025 ch\u1eef s\u1ed1 1) cho 15 th\u00ec thu \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0 m\u1ed9t s\u1ed1 c\u00f3 duy nh\u1ea5t m\u1ed9t ch\u1eef s\u1ed1 <img loading=\"lazy\" decoding=\"async\" alt=\"a\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"8\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-126ada257e914b9348fa1bafdafdca64_l3.png\" style=\"vertical-align: 0px;\" title=\"Rendered by QuickLaTeX.com\" width=\"9\"\/> \u1edf h\u00e0ng ph\u1ea7n ch\u1ee5c sau d\u1ea5u ph\u1ea9y. Gi\u00e1 tr\u1ecb c\u1ee7a a b\u1eb1ng?<\/p>\n<p><strong>C\u00e2u 25. [M\u1ee9c 3]<\/strong> Cho h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" alt=\"f(x)\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"19\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-153268b89486473ac6434ff7c62add12_l3.png\" style=\"vertical-align: -5px;\" title=\"Rendered by QuickLaTeX.com\" width=\"34\"\/> tho\u1ea3 m\u00e3n <img loading=\"lazy\" decoding=\"async\" alt=\"\\lim_{x \\to 1} \\frac{f(x)+1}{x+1} = -1\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"27\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-113883339ecb064878bfefd99b3c2bef_l3.png\" style=\"vertical-align: -8px;\" title=\"Rendered by QuickLaTeX.com\" width=\"150\"\/>. Gi\u1edbi h\u1ea1n <img loading=\"lazy\" decoding=\"async\" alt=\"\\lim_{x \\to 1} \\frac{x(x+1)f(x)+2}{x+4}\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"27\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-7218d7aa550c117080a133b05dae74a2_l3.png\" style=\"vertical-align: -8px;\" title=\"Rendered by QuickLaTeX.com\" width=\"147\"\/> l\u00e0?<\/p>\n<p><strong>C\u00e2u 26. [M\u1ee9c 3]<\/strong> <strong>\u0110i\u1ec1n s\u1ed1 nguy\u00ean th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng.<\/strong><\/p>\n<p>Bi\u1ebft r\u1eb1ng s\u1ed1 <img loading=\"lazy\" decoding=\"async\" alt=\"8^{3000}\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"15\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-043f7a89058e0586f4316b8c53053b50_l3.png\" style=\"vertical-align: 0px;\" title=\"Rendered by QuickLaTeX.com\" width=\"37\"\/> c\u00f3 hai ch\u1eef s\u1ed1 t\u1eadn c\u00f9ng l\u00e0 <img loading=\"lazy\" decoding=\"async\" alt=\"\u2026ab\" class=\"ql-img-inline-formula quicklatex-auto-format\" height=\"12\" src=\"https:\/\/77.buffdemo.com\/wp-content\/uploads\/2026\/04\/quicklatex-com-ebdd10313c9c58032a6cf784a729a334_l3.png\" style=\"vertical-align: 0px;\" title=\"Rendered by QuickLaTeX.com\" width=\"40\"\/>.<\/p>\n<p>a. Gi\u00e1 tr\u1ecb c\u1ee7a a b\u1eb1ng <strong><em><br \/><\/em><\/strong>b. Gi\u00e1 tr\u1ecb c\u1ee7a b b\u1eb1ng<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>T\u00e0i li\u1ec7u \u00f4n thi ti\u1ebfp t\u1ee5c chia s\u1ebb B\u1ed9 5 \u0111\u1ec1 To\u00e1n TSA \u2013 \u0110H B\u00e1ch Khoa H\u00e0 N\u1ed9i t\u1eeb \u0110\u1ec1 21 \u0111\u1ebfn \u0110\u1ec1 25 do b\u1ea1n Ph\u1ea1m T\u00fa Khanh bi\u00ean so\u1ea1n. B\u1ed9 \u0111\u1ec1 n\u00e0y l\u00e0 ph\u1ea7n b\u1ed5 sung c\u1ea7n thi\u1ebft cho qu\u00e1 tr\u00ecnh luy\u1ec7n thi, gi\u00fap c\u00e1c b\u1ea1n n\u00e2ng cao k\u1ef9 n\u0103ng v\u00e0 l\u00e0m [&#8230;]\n","protected":false},"author":1,"featured_media":975,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-999","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-toan-hoc-tsa"],"_links":{"self":[{"href":"https:\/\/77.buffdemo.com\/index.php\/wp-json\/wp\/v2\/posts\/999","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/77.buffdemo.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/77.buffdemo.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/77.buffdemo.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/77.buffdemo.com\/index.php\/wp-json\/wp\/v2\/comments?post=999"}],"version-history":[{"count":0,"href":"https:\/\/77.buffdemo.com\/index.php\/wp-json\/wp\/v2\/posts\/999\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/77.buffdemo.com\/index.php\/wp-json\/wp\/v2\/media\/975"}],"wp:attachment":[{"href":"https:\/\/77.buffdemo.com\/index.php\/wp-json\/wp\/v2\/media?parent=999"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/77.buffdemo.com\/index.php\/wp-json\/wp\/v2\/categories?post=999"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/77.buffdemo.com\/index.php\/wp-json\/wp\/v2\/tags?post=999"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}