Tìm x, biết:
a) \( \dfrac{4}{5}.x= \dfrac{4}{7} \Leftrightarrow x= \dfrac{4}{7}: \dfrac{4}{5} \Leftrightarrow \dfrac{5}{7};\)
b) \( \dfrac{3}{4}.x= \dfrac{1}{2} \Leftrightarrow x= \dfrac{3}{4}: \dfrac{1}{2} \Leftrightarrow \dfrac{3}{2};\)
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