展开 (5,1)y(7,-7)

解答

展开

(5, 1) y (7, - 7)

7 (5 \cdot 1,) y, - 7 (5 \cdot 1,) y

求解步骤

(5, 1) y (7, - 7)

= (5 \cdot 1,) (7, - 7) y

使用分配律:

a (b - c) = ab - a c

a = (5, 1) y, b = 7,, c = 7

= (5, 1) y \cdot 7, - (5, 1) y \cdot 7

= 7 (5 \cdot 1,) y, - 7 (5 \cdot 1,) y

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