$$E1.25\times40$$
$10$
$$\frac{\mathrm{d}}{\mathrm{d}E_{1}}(E_{1}\times 10)$$
$$10E_{1}^{1-1}$$
$$10E_{1}^{0}$$
$$10\times 1$$
$$10$$
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$10E_{1}$
$$E_{1}\times 10$$
