Giải bài tập 2.4 trang 64 SGK Toán 12 tập 1 - Cùng khám phá

Cho hình hộp ABCD.EFGH. Đặt \(\overrightarrow {AB} = \vec a,\overrightarrow {AD} = \vec b,\overrightarrow {AE} = \vec c\). Gọi M là trung điểm của đoạn BG. Hãy biểu diễn \(\overrightarrow {AM} \) theo \(\vec a,\vec b,\vec c\).

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Đề bài

Phương pháp giải - Xem chi tiết

Sử dụng quy tắc ba điểm, hình bình hành để biểu diễn \(\overrightarrow {AM} \) theo \(\vec a,\vec b,\vec c\).

Lời giải chi tiết

- Áp dụng quy tắc ba điểm, ta có: \(\overrightarrow {AM} = \overrightarrow {AB} + \overrightarrow {BM} \) - Vì M là trung điểm BG nên: \(\overrightarrow {AM} = \overrightarrow {AB} + \frac{1}{2}\overrightarrow {BG} \) - Mà ABCD.EFGH là hình hộp nên: \(\overrightarrow {AM} = \overrightarrow {AB} + \frac{1}{2}\overrightarrow {AH} = \overrightarrow {AB} + \frac{1}{2}\left( {\overrightarrow {AD} + \overrightarrow {AE} } \right) = \overrightarrow a + \frac{1}{2}\overrightarrow b + \frac{1}{2}\overrightarrow c \)

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💝 Giải bài tập 2.5 trang 65 SGK Toán 12 tập 1 - Cùng khám phá Cho hình lăng trụ tam giác ABC.A'B'C'. Gọi G, G' lần lượt là trọng tâm các tam giác ABC và A'B'C'. O là giao điểm của hai đường thẳng AB' và A'B. a) Chứng minh rằng các đường thẳng GO và CG' song song với nhau. b) Tính độ dài của \(\overrightarrow {GO} \)trong trường hợp ABC.A'B'C' là hình lăng trụ đứng, cạnh bên AA' = 3 và đáy là tam giác đều có cạnh bằng 2.
✨ Giải bài tập 2.6 trang 65 SGK Toán 12 tập 1 - Cùng khám phá Trọng lực \(\vec P\) là lực hấp dẫn do Trái Đất tác dụng lên một vật được tính bởi công thức \(\vec P = m\vec g\), trong đó \(m\) là khối lượng của vật (đơn vị: kg), \(\vec g\) là vectơ gia tốc rơi tự do, có hướng đi xuống và có độ lớn \(g = 9,8{\mkern 1mu} {\rm{m/}}{{\rm{s}}^2}\). Xác định hướng và độ lớn của trọng lực (đơn vị: N) tác dụng lên quả bóng có khối lượng 450 gam.
𓃲 Giải bài tập 2.7 trang 65 SGK Toán 12 tập 1 - Cùng khám phá Cho hình lập phương ABCD.EFGH có cạnh bằng a. Tính: a) \(\overrightarrow {BC} .\overrightarrow {AH} ;\) b) \(\overrightarrow {AF} .\overrightarrow {EG} ;\) c) \(\overrightarrow {AC} .\overrightarrow {FE} .\)
🌳 Giải bài tập 2.8 trang 65 SGK Toán 12 tập 1 - Cùng khám phá Cho hình hộp ABCD.A’B’C’D’ có tất cả các cạnh đều bằng a và (widehat {BAA'} = widehat {BAD} = widehat {DAA'} = {60^circ }). Tính độ dài đường chéo AC’.
𝓡 Giải bài tập 2.9 trang 65 SGK Toán 12 tập 1 - Cùng khám phá Cho tứ diện ABCD. Hai điểm M và N theo thứ tự là trung điểm của BC và AD. Cho biết AB = 10, CD = 6, MN = 7. a) Chứng minh rằng (overrightarrow {NM} = frac{1}{2}left( {overrightarrow {AB} + overrightarrow {DC} } right)). b) Từ kết quả câu a, hãy tính (overrightarrow {AB} .overrightarrow {DC} ). c) Tính (left( {overrightarrow {AB} ,overrightarrow {DC} } right)).

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