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1. \(\dfrac{42b}{5a}:\dfrac{6b}{5a}=\) [ ].
2. \(\dfrac{8b^8}{a^4}:\dfrac{4b^7}{7a^4}=\) [ ].
3. \(\dfrac{5x^4}{y^7}:\dfrac{5x^3}{7y^7}=\) [ ].