展开 P(1,-4)y

解答

展开

P (1, - 4) y

1 \cdot P y, - 4 P y

求解步骤

P (1, - 4) y

= (1, - 4) P y

使用分配律:

a (b - c) = ab - a c

a = P y, b = 1,, c = 4

= P y \cdot 1, - P y \cdot 4

= 1 \cdot P y, - 4 P y

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