展开 2/9 (3k-1)

解答

展开

\frac{2}{9} (3 k - 1)

\frac{2 k}{3} - \frac{2}{9}

求解步骤

\frac{2}{9} (3 k - 1)

使用分配律:

a (b - c) = ab - a c

\frac{2}{9} (3 k - 1) = \frac{2}{9} \cdot 3 k - \frac{2}{9} \cdot 1

= \frac{2}{9} \cdot 3 k - \frac{2}{9} \cdot 1

化简

\frac{2}{9} \cdot 3 k - \frac{2}{9} \cdot 1 : \frac{2 k}{3} - \frac{2}{9}

= \frac{2 k}{3} - \frac{2}{9}

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