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Giải thích
a) \(\frac{2}{3} - \frac{a}{b} + \frac{1}{4} = \frac{1}{6}\)
\( \to (\frac{2}{3} + \frac{1}{4}) - \frac{a}{b} = \frac{1}{6}\)
\( \to \frac{{11}}{{12}} - \frac{a}{b} = \frac{1}{6}\)
\( \to \frac{a}{b} = \frac{{11}}{{12}} - \frac{1}{6}\)
\( \to \frac{a}{b} = \frac{9}{{12}} = \frac{3}{4}\)
b) \(\frac{1}{4} - \frac{1}{3} + \frac{a}{b} = \frac{1}{{12}} \Rightarrow \frac{a}{b} = \frac{1}{6}\)