展开 40((3x-15)/1)

解答

展开

40 (\frac{3 x - 15}{1})

120 x - 600

求解步骤

40 (\frac{3 x - 15}{1})

去除括号:

(a) = a

= 40 \cdot \frac{3 x - 15}{1}

使用法则

\frac{a}{1} = a

= 40 (3 x - 15)

使用分配律:

a (b - c) = ab - a c

a = 40, b = 3 x, c = 15

= 40 \cdot 3 x - 40 \cdot 15

化简

40 \cdot 3 x - 40 \cdot 15 : 120 x - 600

= 120 x - 600

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