$${ 7 }^{ 2 } { 1 }^{ 2 } x { 8 }^{ 2 } { 9 }^{ 2 } =$$
$254016x$
$$49\times 1^{2}x\times 8^{2}\times 9^{2}$$
$$49\times 1x\times 8^{2}\times 9^{2}$$
$$49x\times 8^{2}\times 9^{2}$$
$$49x\times 64\times 9^{2}$$
$$3136x\times 9^{2}$$
$$3136x\times 81$$
$$254016x$$
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$254016$
$$\frac{\mathrm{d}}{\mathrm{d}x}(49\times 1^{2}x\times 8^{2}\times 9^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(49\times 1x\times 8^{2}\times 9^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(49x\times 8^{2}\times 9^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(49x\times 64\times 9^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(3136x\times 9^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(3136x\times 81)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(254016x)$$
$$254016x^{1-1}$$
$$254016x^{0}$$
$$254016\times 1$$
$$254016$$
