Cách làm cho bạn:
$\frac{12}{17}$ : 4 = $\frac{12}{17}$ x $\frac{4}{1}$ = $\frac{48}{17}$
$12 : \frac{6}{13}=\frac{12\times 13}{13}\times \frac{13}{6}= \frac{2028}{48}=26$
$9 \times \frac{5}{3}\times \frac{4}{15}=\frac{9\times 5\times 4}{1\times 3\times 15}=\frac{180}{45}=4$
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