展开 a(2,-4)b(6,3)

解答

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a (2, - 4) b (6, 3)

2 (6 \cdot 3,) ab, - 4 (6 \cdot 3,) ab

求解步骤

a (2, - 4) b (6, 3)

= (2, - 4) (6 \cdot 3,) ab

使用分配律:

a (b - c) = ab - a c

a = ab (6, 3), b = 2,, c = 4

= ab (6, 3) \cdot 2, - ab (6, 3) \cdot 4

= 2 (6 \cdot 3,) ab, - 4 (6 \cdot 3,) ab

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