Divide :
12\dfrac{1}{2}21 ÷ 13\dfrac{1}{3}31
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We have:
=12÷13=12×31[Reciprocal of 13 is 31]=1×32×1=32=112\begin{array}{ll} \phantom{=} \dfrac{1}{2} ÷ \dfrac{1}{3} \\ = \dfrac{1}{2} \times \dfrac{3}{1} & [\text{Reciprocal of } \dfrac{1}{3} \text{ is } \dfrac{3}{1}] \\ = \dfrac{1 \times 3}{2 \times 1} \\ = \dfrac{3}{2} \\ = 1\dfrac{1}{2} \end{array}=21÷31=21×13=2×11×3=23=121[Reciprocal of 31 is 13]
∴ The answer is 1121\dfrac{1}{2}121
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Find the reciprocal of :
1121\dfrac{1}{2}121
12518125\dfrac{1}{8}12581
314\dfrac{3}{14}143 ÷ 1142\dfrac{11}{42}4211
1 ÷ 6236\dfrac{2}{3}632