Giải bài tập 2 trang 87 SGK Toán 12 tập 2 - Cánh diều

Đường thẳng \(d:\frac{{x - 2}}{3} = \frac{{y - 3}}{6} = \frac{{z - 1}}{9}\) có một vectơ chỉ phương là: A. \(\overrightarrow {{u_1}} = \left( {2;3;1} \right)\). B. \(\overrightarrow {{u_2}} = \left( {6;3;9} \right)\). C. \(\overrightarrow {{u_3}} = \left( {3;9;6} \right)\). D. \(\overrightarrow {{u_4}} = \left( {1;2;3} \right)\).

⛎Tổng hợp đề thi học kì 2 lớp 12 tất cả các môn - Cánh diều

Toán - Văn - Anh - Hoá - Sinh - Sử - Địa

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Đề bài

Phương pháp giải - Xem chi tiết

Sử dụng kiến thức về phương trình chính tắc của đường thẳng để tìm vectơ chỉ phương: Nếu \(abc \ne 0\) thì hệ phương trình \(\frac{{x - {x_0}}}{a} = \frac{{y - {y_0}}}{b} = \frac{{z - {z_0}}}{c}\) được gọi là phương trình chính tắc của đường thẳng \(\Delta \) đi qua \({M_0}\left( {{x_0};{y_0};{z_0}} \right)\) và có vectơ chỉ phương \(\overrightarrow u = \left( {a;b;c} \right)\).

Lời giải chi tiết

Đường thẳng \(d:\frac{{x - 2}}{3} = \frac{{y - 3}}{6} = \frac{{z - 1}}{9}\) có một vectơ chỉ phương là \(\overrightarrow {{u_4}} = \left( {1;2;3} \right)\). Chọn D

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3.7 trên 6 phiếu

♈ Giải bài tập 3 trang 87 SGK Toán 12 tập 2 - Cánh diều a) Mặt cầu (S): có bán kính là: A. 10. B. 11. C. 12. D. 13. b) Tọa độ tâm của mặt cầu (S): \({\left( {x - 5} \right)^2} + {\left( {y + 6} \right)^2} + {\left( {z - 7} \right)^2} = 8\) là: A. (-5; 6; 7). B. (5; 6; -7). C. (5; -6; 7). D. (-5; 6; 7).
𝄹 Giải bài tập 4 trang 87 SGK Toán 12 tập 2 - Cánh diều Khoảng cách từ điểm M(a; b; c) đến mặt phẳng \(x - a - b - c = 0\) là: A. \(\left| {a + b} \right|\). B. \(\left| {b + c} \right|\). C. \(\left| {c + a} \right|\). D. \(\frac{{\left| {b + c} \right|}}{{\sqrt {{a^2} + {b^2} + {c^2}} }}\).
𝕴 Giải bài tập 5 trang 87 SGK Toán 12 tập 2 - Cánh diều Cho bốn điểm A(0; 1; 3), B(-1; 0; 5), C(2; 0; 2) và D(1; 1; -2). a) Tìm tọa độ của các vectơ \(\overrightarrow {AB} ,\overrightarrow {AC} \) và một vectơ vuông góc với cả hai vectơ đó. b) Viết phương trình tham số và phương trình chính tắc của đường thẳng AB và AC. c) Viết phương trình tổng quát của mặt phẳng (ABC). d) Chứng minh rằng bốn điểm A, B, C, D không đồng phẳng. e) Tính khoảng cách từ điểm D đến mặt phẳng (ABC).
꧂ Giải bài tập 6 trang 87 SGK Toán 12 tập 2 - Cánh diều Viết phương trình tổng quát của mặt phẳng (P) trong mỗi trường hợp sau: a) (P) đi qua điểm M(-3; 1; 4) và có một vectơ pháp tuyến là \(\overrightarrow n = \left( {2; - 4;1} \right)\); b) (P) đi qua điểm N(2; -1; 5) và có cặp vectơ chỉ phương là \(\overrightarrow {{u_1}} = \left( {1; - 3; - 2} \right)\) và \(\overrightarrow {{u_2}} = \left( { - 3;4;1} \right)\); c) (P) đi qua điểm I(4; 0; -7) và song song với mặt phẳng \(\left( Q \right):2x + y - z - 3 = 0\); d) (P) đi qua điểm K(-4; 9; 2)
✃ Giải bài tập 7 trang 88 SGK Toán 12 tập 2 - Cánh diều Viết phương trình của mặt cầu (S) trong mỗi trường hợp sau: a) (S) có tâm I(4; -2; 1) và bán kính \(R = 9\); b) (S) có tâm I(3; 2; 0) và đi qua điểm M(2; 4; -1); c) (S) có đường kính là đoạn thẳng AB với A(1; 2; 0) và B(-1; 0; 4).

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