Sách Toán – Học Toán – Đề Thi Toán https://booktoan.com Học toán, Đề thi toán, Sách giáo khoa Toán, trắc nghiệm Toán online Fri, 09 Oct 2026 13:42:40 +0000 vi hourly 1 https://wordpress.org/?v=7.1.3 Cho cấp số cộng $(u_n)$ thỏa mãn $u_2 + u_{10} = 24$ và $S_6 = 33$. Tìm công sai $d$ và số hạng đầu $u_1$ https://booktoan.com/cho-cap-so-cong-u_n-thoa-man-u_2-u_10-24-va-s_6-33-tim-cong-sai-d-va-so-hang-dau-u_1.html https://booktoan.com/cho-cap-so-cong-u_n-thoa-man-u_2-u_10-24-va-s_6-33-tim-cong-sai-d-va-so-hang-dau-u_1.html#respond Fri, 09 Oct 2026 13:42:40 +0000 https://booktoan.com/cho-cap-so-cong-u_n-thoa-man-u_2-u_10-24-va-s_6-33-tim-cong-sai-d-va-so-hang-dau-u_1.html https://booktoan.com/cho-cap-so-cong-u_n-thoa-man-u_2-u_10-24-va-s_6-33-tim-cong-sai-d-va-so-hang-dau-u_1.html/feed 0 Giải phương trình lượng giác $\cos(3x – 45^\circ) = \frac{\sqrt{2}}{2}$ và các mệnh đề liên quan https://booktoan.com/giai-phuong-trinh-luong-giac-cos3x-45circ-fracsqrt22-va-cac-menh-de-lien-quan.html https://booktoan.com/giai-phuong-trinh-luong-giac-cos3x-45circ-fracsqrt22-va-cac-menh-de-lien-quan.html#respond Sun, 04 Oct 2026 01:29:53 +0000 https://booktoan.com/giai-phuong-trinh-luong-giac-cos3x-45circ-fracsqrt22-va-cac-menh-de-lien-quan.html https://booktoan.com/giai-phuong-trinh-luong-giac-cos3x-45circ-fracsqrt22-va-cac-menh-de-lien-quan.html/feed 0 Giải phương trình lượng giác $\sqrt{3}\tan(2x – 30^\circ) = 3$ trong khoảng $(0^\circ; 180^\circ)$ https://booktoan.com/giai-phuong-trinh-luong-giac-sqrt3tan2x-30circ-3-trong-khoang-0circ-180circ.html https://booktoan.com/giai-phuong-trinh-luong-giac-sqrt3tan2x-30circ-3-trong-khoang-0circ-180circ.html#respond Sun, 04 Oct 2026 01:16:54 +0000 https://booktoan.com/giai-phuong-trinh-luong-giac-sqrt3tan2x-30circ-3-trong-khoang-0circ-180circ.html https://booktoan.com/giai-phuong-trinh-luong-giac-sqrt3tan2x-30circ-3-trong-khoang-0circ-180circ.html/feed 0 Đề thi thử THPT Quốc gia 2017 môn toán – Phần 23 https://booktoan.com/de-thi-thu-thpt-quoc-gia-2017-mon-toan-phan-23.html https://booktoan.com/de-thi-thu-thpt-quoc-gia-2017-mon-toan-phan-23.html#respond Sat, 18 Feb 2017 14:54:18 +0000 https://booktoan.com/?p=3262 https://booktoan.com/de-thi-thu-thpt-quoc-gia-2017-mon-toan-phan-23.html/feed 0 100 đề thi thử THPT Quốc gia 2017 môn toán https://booktoan.com/100-de-thi-thu-thpt-quoc-gia-2017-mon-toan.html https://booktoan.com/100-de-thi-thu-thpt-quoc-gia-2017-mon-toan.html#comments Fri, 27 Jan 2017 14:06:29 +0000 https://booktoan.com/?p=3173 https://booktoan.com/100-de-thi-thu-thpt-quoc-gia-2017-mon-toan.html/feed 3