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Trần Quỳnh Anh 27/12/2017 at 19:29\(\Rightarrow x=\dfrac{2}{7}+\dfrac{2}{5}\)
\(\Rightarrow x=\dfrac{10}{35}+\dfrac{14}{35}\)
\(\Rightarrow x=\dfrac{10+14}{35}\)
\(\Rightarrow x=\dfrac{24}{35}\)
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Thanh Trà 13/08/2017 at 20:03x - \(\dfrac{2}{5}\) = \(\dfrac{2}{7}\)
x = \(\dfrac{2}{7}\) + \(\dfrac{2}{5}\)
x = \(\dfrac{24}{35}\)
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