展开 p(1,-3)7

解答

展开

p (1, - 3) 7

7 \cdot 1 \cdot p, - 7 \cdot 3 p

求解步骤

p (1, - 3) \cdot 7

= 7 (1, - 3) p

使用分配律:

a (b - c) = ab - a c

a = p \cdot 7, b = 1,, c = 3

= p \cdot 7 \cdot 1, - p \cdot 7 \cdot 3

= 7 \cdot 1 \cdot p, - 7 \cdot 3 p

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