Question

rút gọn các phân số sau

\(\frac{199........9}{999.......5}\)20 chữ số 9 ở mẩu 20 chữ số 9 ở tử

\(\frac{121212}{424242}\)

\(\frac{187187187}{221221221}\)

\(\frac{20082008}{20112011}\)

giúp mk nha,ai nhanh ,đúng mk tc cho 

Answer 1

\(\frac{199.......9}{999.......5}=\frac{199.......9:199.......9}{999.......5:199........9}=\frac{1}{5}\)

\(\frac{121212}{424242}=\frac{121212:10101}{424242:10101}=\frac{12}{42}\)

\(\frac{187187187}{221221221}=\frac{187187187:1001001}{221221221:1001001}=\frac{187}{221}\)

\(\frac{20082008}{20112011}=\frac{20082008:10001}{20112011:10001}=\frac{2008}{2011}\)

Answer 2

\(\frac{199...9}{99...95}\)=\(\frac{199...9:199...9}{99...95:199...9}\)\(\frac{\left(20so9\right)}{\left(20so9\right)}\)

=\(\frac{1}{5}\)