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\(\dfrac{48}{36} = \dfrac{12 \cdot 4}{12 \cdot 3} = \dfrac{4}{3}\) .

1. \(\dfrac{32}{48} =\) [ ].
2. \(\dfrac{25}{35} = \) [ ].
3. \(\dfrac{42}{49} = \) [ ].
4. \(\dfrac{72}{81} = \) [ ].
5. \(\dfrac{64}{72} = \) [ ].