Bài 2:
1: Ta có: \(\dfrac{2}{7}+\dfrac{5}{7}\cdot\dfrac{14}{25}\)
\(=\dfrac{2}{7}+\dfrac{2}{5}\)
\(=\dfrac{10}{35}+\dfrac{14}{35}=\dfrac{24}{35}\)
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Bài 2:
2: Ta có: \(\dfrac{4}{7}:\left(\dfrac{2}{5}\cdot\dfrac{4}{7}\right)\)
\(=\dfrac{4}{7}:\dfrac{8}{35}\)
\(=\dfrac{4}{7}\cdot\dfrac{35}{8}\)
\(=\dfrac{5}{2}\)
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