$$-\frac{25r^{2}s^{2}}{2r^{3}}\times(-\frac{4}{5}s^{3})$$
$\frac{10s^{5}}{r}$
$$\left(-\frac{25s^{2}}{2r}\right)\left(-\frac{4}{5}\right)s^{3}$$
$$\frac{25s^{2}\times 4}{2r\times 5}s^{3}$$
$$\frac{2\times 5s^{2}}{r}s^{3}$$
$$\frac{2\times 5s^{2}s^{3}}{r}$$
$$\frac{2\times 5s^{5}}{r}$$
$$\frac{10s^{5}}{r}$$
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$\frac{50s^{4}}{r}$
