展开 A(3,-4)yB(5.2)

解答

展开

A (3, - 4) y B (5.2)

3 (5.2) A y B, - 4 (5.2) A y B

求解步骤

A (3, - 4) y B (5.2)

= (5.2) (3, - 4) A y B

使用分配律:

a (b - c) = ab - a c

a = A y B (5.2), b = 3,, c = 4

= A y B (5.2) \cdot 3, - A y B (5.2) \cdot 4

= 3 (5.2) A y B, - 4 (5.2) A y B

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