$$121 \div 11 \times 16 ( b )$$
$176b$
$$11\times 16b$$
$$176b$$
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$176$
$$\frac{\mathrm{d}}{\mathrm{d}b}(11\times 16b)$$
$$\frac{\mathrm{d}}{\mathrm{d}b}(176b)$$
$$176b^{1-1}$$
$$176b^{0}$$
$$176\times 1$$
$$176$$