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Thanh Trà 13/08/2017 at 20:05
x + \(\dfrac{2}{5}\) = \(\dfrac{1}{2}\)
x = \(\dfrac{1}{2}\) + \(\dfrac{2}{5}\)
x = \(\dfrac{9}{10}\)
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Yuki Judai 13/08/2017 at 14:58
\(x+\dfrac{2}{5}=\dfrac{1}{2}\)
\(x=\dfrac{1}{2}+\dfrac{2}{5}\)
\(x=\dfrac{9}{10}\)
mình mình lại