求下列各式的积
\( \frac{7}{5} x^{2} y\left(\frac{3}{5} x y^{2}+\frac{2}{5} x\right) \)
已知
\( \frac{7}{5} x^{2} y\left(\frac{3}{5} x y^{2}+\frac{2}{5} x\right) \)
要求
我们需要求出给定的积。
解答
$\frac{7}{5} x^{2} y(\frac{3}{5} x y^{2}+\frac{2}{5} x)=\frac{7}{5} x^{2} y \times \frac{3}{5} x y^{2}+\frac{7}{5} x^{2} y \times \frac{2}{5} x$
$=\frac{21}{25} x^{2+1} y^{1+2}+\frac{14}{25} x^{2+1} y$
$=\frac{21}{25} x^{3} y^{3}+\frac{14}{25} x^{3} y$
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