展开 3(20-x=44)

解答

展开

3 (20 - x = 44)

60 - 3 x = 44

求解步骤

3 (20 - x = 44)

= 3 (20 - 44 = x)

使用分配律:

a (b - c) = ab - a c

a = 3, b = 20, c = x = 44

3 \cdot 20 - 3 x = 44

乘开

3 \cdot 20 - 3 x : 60 - 3 x

60 - 3 x = 44

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