\(x\): \(\dfrac{2}{3}\) + \(\dfrac{1}{7}\) = \(\dfrac{2}{7}\)
\(x\) : \(\dfrac{2}{3}\) = \(\dfrac{2}{7}\) - \(\dfrac{1}{7}\)
\(x\): \(\dfrac{2}{3}\) = \(\dfrac{1}{7}\)
\(x\) = \(\dfrac{1}{7}\) \(\times\) \(\dfrac{2}{3}\)
\(x\) = \(\dfrac{2}{21}\)
b, \(x\times\dfrac{1}{5}\) + \(x\) \(\times\)\(\dfrac{4}{5}\) = 2
\(x\) \(\times\) ( \(\dfrac{1}{5}\) + \(\dfrac{4}{5}\)) = 2
\(x\) \(\times\) \(\dfrac{5}{5}\) = 2
\(x\) \(\times\) 1 = 2
\(x\) = 2 : 1
\(x\) = 2
\(x\div\dfrac{1}{7}=\dfrac{2}{7}\) \(x\times\dfrac{1}{5}+x\times\dfrac{4}{5}=2\)
\(x=\dfrac{2}{7}\times\dfrac{1}{7}\) \(x\times\left(\dfrac{1}{5}+\dfrac{4}{5}\right)=2\)
\(x=\dfrac{3}{7}\) \(x\times\dfrac{5}{5}=2\)
\(x=2\div1\)
\(x=2\)
# Ninh OSS
