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heou1280
2 năm trước
Câu 9. Cho hình lăng trụ tam giác ABC.$A_{1}$ $B_{1}$ $C_{1}$ . Đặt vecto A$A_{1}$=a, vecto AB=b, vecto AC=d, vecto B $C_{1}$ =d trong các đẳng thức sau đẳng thức nào đúng. A.vecto a+b+c+d=vecto 0 B.vecto a+b+c= vecto d C.vecto b-c+d=vecto 0 D.vecto a=vecto b+c
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