展开 P(1,-2)Q(3,4)

解答

展开

P (1, - 2) Q (3, 4)

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

求解步骤

P (1, - 2) Q (3, 4)

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

使用分配律:

a (b - c) = ab - a c

a = PQ (3, 4), b = 1,, c = 2

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

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

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