$$1\times.6^{2}x\div3$$
$\frac{3x}{25}$
$$\frac{1\times 0.36x}{3}$$
$$\frac{0.36x}{3}$$
$$0.12x$$
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$0.12$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{1\times 0.36x}{3})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{0.36x}{3})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(0.12x)$$
$$0.12x^{1-1}$$
$$0.12x^{0}$$
$$0.12\times 1$$
$$0.12$$