展开 P(8,-7)yQ(13,7)

解答

展开

P (8, - 7) y Q (13, 7)

8 (13 \cdot 7,) P y Q, - 7 (13 \cdot 7,) P y Q

求解步骤

P (8, - 7) y Q (13, 7)

= (8, - 7) (13 \cdot 7,) P y Q

使用分配律:

a (b - c) = ab - a c

a = P y Q (13, 7), b = 8,, c = 7

= P y Q (13, 7) \cdot 8, - P y Q (13, 7) \cdot 7

= 8 (13 \cdot 7,) P y Q, - 7 (13 \cdot 7,) P y Q

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