Tìm x biết \(\begin{array}{l} - 0,5 + \frac{3}{{10}} + 2x = 1 \end{array}\)
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Lời giải:
Báo sai\(\begin{array}{l} - 0,5 + \frac{3}{{10}} + 2x = 1\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2x = 1 + 0,5 - \frac{3}{{10}}\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2x = 1,5 - \frac{3}{{10}}\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2x = \frac{{15}}{{10}} - \frac{3}{{10}}\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2x = \frac{{12}}{{10}} = \frac{6}{5}\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = \frac{3}{5} \end{array}\)
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