Cách làm cho bạn:
$\left ( \frac{2}{3}\times \frac{4}{5} \right )\times \frac{3}{4}=\frac{8}{15}\times \frac{3}{4}=\frac{24}{60}$
$\frac{2}{3}\times \left ( \frac{4}{5}\times \frac{3}{4} \right )=\frac{2}{3}\times \frac{12}{20}=\frac{24}{60}$
So sánh: $\left ( \frac{2}{3}\times \frac{4}{5} \right )\times \frac{3}{4}= \frac{2}{3}\times \left ( \frac{4}{5}\times \frac{3}{4} \right )$
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