$$\frac{8x^{2}2}{10xy^{2}}$$
$\frac{8x}{5y^{2}}$
$$\frac{2\times 4x}{5y^{2}}$$
$$\frac{8x}{5y^{2}}$$
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$\frac{8}{5y^{2}}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{16}{10y^{2}}x^{2-1})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{8}{5y^{2}}x^{1})$$
$$\frac{8}{5y^{2}}x^{1-1}$$
$$\frac{8}{5y^{2}}x^{0}$$
$$\frac{8}{5y^{2}}\times 1$$
$$\frac{8}{5y^{2}}$$