展开 a(4,-6)b(3,8)

解答

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a (4, - 6) b (3, 8)

4 (3 \cdot 8,) ab, - 6 (3 \cdot 8,) ab

求解步骤

a (4, - 6) b (3, 8)

= (4, - 6) (3 \cdot 8,) ab

使用分配律:

a (b - c) = ab - a c

a = ab (3, 8), b = 4,, c = 6

= ab (3, 8) \cdot 4, - ab (3, 8) \cdot 6

= 4 (3 \cdot 8,) ab, - 6 (3 \cdot 8,) ab

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