$$2 a ^ { 5 } 10 a ^ { 5 }$$
$20a^{10}$
$$2a^{10}\times 10$$
$$20a^{10}$$
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$200a^{9}$
$$\frac{\mathrm{d}}{\mathrm{d}a}(2a^{10}\times 10)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(20a^{10})$$
$$10\times 20a^{10-1}$$
$$200a^{10-1}$$
$$200a^{9}$$
