$$10\cdot101\times1o1o1$$
$1010o_{1}^{2}$
$$10\times 101\times 1o_{1}^{2}$$
$$1010\times 1o_{1}^{2}$$
$$1010o_{1}^{2}$$
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$2020o_{1}$
$$\frac{\mathrm{d}}{\mathrm{d}o_{1}}(10\times 101\times 1o_{1}^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}o_{1}}(1010\times 1o_{1}^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}o_{1}}(1010o_{1}^{2})$$
$$2\times 1010o_{1}^{2-1}$$
$$2020o_{1}^{2-1}$$
$$2020o_{1}^{1}$$
$$2020o_{1}$$
