Tìm x biết \(\frac{1}{5}.x + \frac{1}{4} = \frac{7}{5}\)
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Lời giải:
Báo sai\(\begin{array}{l} \frac{1}{5}.x + \frac{1}{4} = \frac{7}{5}\\ \,\,\,\,\,\,\,\,\,\,\,\frac{1}{5}.x = \frac{7}{5} - \frac{1}{4}\\ \,\,\,\,\,\,\,\,\,\,\frac{1}{5}.x = \frac{{28}}{{20}} - \frac{5}{{20}}\\ \,\,\,\,\,\,\,\,\,\,\frac{1}{5}.x = \frac{{23}}{{20}}\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = \frac{{23}}{{20}}:\frac{1}{5}\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = \frac{{23}}{{20}}.\frac{5}{1}\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = \frac{{23.5}}{{20}}\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = \frac{{23}}{4} \end{array}\)
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