化简 15(2/5+3x)

解答

化简

15 (\frac{2}{5} + 3 x)

45 x + 6

求解步骤

15 (\frac{2}{5} + 3 x)

合并

\frac{2}{5} + 3 x : \frac{15 x + 2}{5}

= 15 \cdot \frac{15 x + 2}{5}

使用分式法则:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{15 ( 15 x + 2 )}{5}

数字相除:

\frac{15}{5} = 3

= 3 (15 x + 2)

展开

3 (15 x + 2) : 45 x + 6

= 45 x + 6

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