Question
Multiply: $\frac{-11}{13}\ \text{by}\ \frac{-21}{7}$
✓
Answer
$\frac{-11}{13}\ \text{by}\ \frac{-21}{7}=\frac{(-11)\times(-21)}{13\times7}$ $=\frac{231}{91}=\frac{231\div7}{91\div7}=\frac{33}{13}$
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