展开 P(-4,-2)Q(4,3)

解答

展开

P (- 4, - 2) Q (4, 3)

- 4 (4 \cdot 3,) PQ, - 2 (4 \cdot 3,) PQ

求解步骤

P (- 4, - 2) Q (4, 3)

= (- 4, - 2) (4 \cdot 3,) PQ

使用分配律:

a (b - c) = ab - a c

a = PQ (4, 3), b = - 4,, c = 2

= PQ (4, 3) (- 4,) - PQ (4, 3) \cdot 2

使用加减运算法则

+ (- a) = - a

= - 4 (4 \cdot 3,) PQ, - 2 (4 \cdot 3,) PQ

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