$$= \left( \begin{array} { l } { 1019000 \times 100 } \\ { ( 0.1 ) \times \frac { 1 } { 10 } \times 15 ( 100 \times 15 \times 10 ^ { 2 } \times 15 } \\ { 10 } \end{array} \right)$$
$101900000$
$$\frac{\mathrm{d}}{\mathrm{d}l}(l\times 101900000)$$
$$101900000l^{1-1}$$
$$101900000l^{0}$$
$$101900000\times 1$$
$$101900000$$
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$101900000l$
$$l\times 101900000$$
