展开 2(v+30=10)

解答

展开

2 (v + 30 = 10)

2 v + 60 = 10

求解步骤

2 (v + 30 = 10)

= 2 (v + 30 \cdot 10 =)

使用分配律:

a (b + c) = ab + a c

a = 2, b = v, c = 30 = 10

2 v + 2 \cdot 30 = 10

乘开

2 v + 2 \cdot 30 : 2 v + 60

2 v + 60 = 10

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