展开 (2,1,-1)*(1,x,0)

解答

展开

(2, 1, - 1) \cdot (1, x, 0)

2 (1 \cdot 0,, x), 1, - 1 \cdot (1 \cdot 0,, x)

求解步骤

(2, 1, - 1) (1, x, 0)

= (2 \cdot 1,, - 1) (1 \cdot 0,, x)

使用分配律:

a (b - c) = ab - a c

a = (1, x, 0), b = 2, 1,, c = 1

= (1, x, 0) \cdot 2, 1, - (1, x, 0) \cdot 1

= 2 (1 \cdot 0,, x), 1, - 1 \cdot (1 \cdot 0,, x)

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