Question

[trần sơn]

\(\frac{25}{42}—\frac{20}{63}\)    

\(\frac{9}{50}-\frac{13}{75}\)

\(\frac{2}{19}-\frac{2}{65}-\frac{4}{39}\)

Answer 1

[Dương]

\(\frac{25}{12}-\frac{20}{63}=\frac{445}{252}\)

\(\frac{9}{50}-\frac{13}{75}=\frac{1}{150}\)

\(\frac{2}{19}-\frac{2}{65}-\frac{4}{39}=\frac{-8}{285}\)