Question

Tính nhanh nếu có thể

\(\left(\frac{-2}{7}+\frac{1}{5}\right)\)/\(\frac{9}{35}+\left(\frac{4}{5}-\frac{5}{7}\right)\)/\(\frac{9}{35}\)

Answer 1

\(\left(-\frac{2}{7}+\frac{1}{5}\right):\frac{9}{35}+\left(\frac{4}{5}-\frac{5}{7}\right):\frac{9}{35}\)

\(=\left(-\frac{2}{7}+\frac{1}{5}+\frac{4}{5}-\frac{5}{7}\right):\frac{9}{35}\)

\(=0:\frac{9}{35}\)

\(=0\)

Answer 2

\(=\frac{-3}{35}\div\frac{9}{35}+\frac{3}{35}\div\frac{9}{35}\)

\(=\left(-\frac{3}{35}+\frac{3}{35}\right)\div\frac{9}{35}\)

\(=0\div\frac{9}{35}\)

\(=0\)