Cách làm cho bạn:
a) \(\frac{4}{5}.x=\frac{4}{7}\)
\(x=\frac{4}{7} \div \frac{4}{5}\)
\(x=\frac{4}{7} .\frac{5}{4}\)
\(x=\frac{5}{7}\)
b) \(\frac{3}{4} \div x=\frac{1}{2}\)
\(x=\frac{3}{4} \div \frac{1}{2}\)
\(x=\frac{3}{4}.2\)
\(x=\frac{3}{2}\)
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