展开 (8,-3)y(2,1)

解答

展开

(8, - 3) y (2, 1)

8 (2 \cdot 1,) y, - 3 (2 \cdot 1,) y

求解步骤

(8, - 3) y (2, 1)

= (8, - 3) (2 \cdot 1,) y

使用分配律:

a (b - c) = ab - a c

a = y (2, 1), b = 8,, c = 3

= y (2, 1) \cdot 8, - y (2, 1) \cdot 3

= 8 (2 \cdot 1,) y, - 3 (2 \cdot 1,) y

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