展开 k*(a,a+3)

解答

展开

k \cdot (a, a + 3)

ak, a + 3 k

求解步骤

k (a, a + 3)

= k (, aa + 3)

使用分配律:

a (b + c) = ab + a c

a = k, b = a, a, c = 3

= ka, a + k \cdot 3

= ak, a + 3 k

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