$$\frac { 1 } { 8 } 80 m =$$
$10m$
$$\frac{80}{8}m$$
$$10m$$
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$10$
$$\frac{\mathrm{d}}{\mathrm{d}m}(\frac{80}{8}m)$$
$$\frac{\mathrm{d}}{\mathrm{d}m}(10m)$$
$$10m^{1-1}$$
$$10m^{0}$$
$$10\times 1$$
$$10$$