展开 P(6,5)yQ(2,-3)

解答

展开

P (6, 5) y Q (2, - 3)

2 (6 \cdot 5,) P y Q, - 3 (6 \cdot 5,) P y Q

求解步骤

P (6, 5) y Q (2, - 3)

= (6 \cdot 5,) (2, - 3) P y Q

使用分配律:

a (b - c) = ab - a c

a = P (6, 5) y Q, b = 2,, c = 3

= P (6, 5) y Q \cdot 2, - P (6, 5) y Q \cdot 3

= 2 (6 \cdot 5,) P y Q, - 3 (6 \cdot 5,) P y Q

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