展开 u(2,-1,3)v(4,-1,2)

解答

展开

u (2, - 1, 3) v (4, - 1, 2)

2 uv, 4, - 2 uv, 1, 2 - 1 \cdot uv, 3 \cdot 4, 1, 3 \cdot 1, 2

求解步骤

u (2, - 1, 3) v (4, - 1, 2)

= (2, - 1 \cdot 3,) (4, - 1 \cdot 2,) uv

乘开

(2, - 1, 3) (4, - 1, 2) : 2, 4, - 2, 1, 2 - 1, 3 \cdot 4, 1, 3 \cdot 1, 2

= uv (2, 4, - 2, 1, 2 - 1, 3 \cdot 4, 1, 3 \cdot 1, 2)

乘开

uv (2, 4, - 2, 1, 2 - 1, 3 \cdot 4, 1, 3 \cdot 1, 2) : 2 uv, 4, - 2 uv, 1, 2 - 1 \cdot uv, 3 \cdot 4, 1, 3 \cdot 1, 2

= 2 uv, 4, - 2 uv, 1, 2 - 1 \cdot uv, 3 \cdot 4, 1, 3 \cdot 1, 2

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