\(0,32=\dfrac{32}{100}=\dfrac{8}{25}\\ -0,124=\dfrac{-124}{1000}=\dfrac{-31}{250}\\ 1,28=\dfrac{128}{100}=\dfrac{32}{25}\\ -3,12=\dfrac{-312}{100}=\dfrac{-78}{25}\)

\(0,32=\dfrac{8}{25}\)

\(-0,124=\dfrac{-31}{250}\)

\(1,28=\dfrac{32}{25}\)

\(-3,12=\dfrac{-78}{25}\)

Chúc bn học tốt!!

c: \(-0.4\left(6\right)=-\dfrac{7}{15}\)

d: \(1,\left(09\right)=\dfrac{12}{11}\)

a, 0.4=\(\frac{4}{10}\) =\(\frac{2}{5}\)

0,02=\(\frac{2}{100}\)=\(\frac{1}{50}\)

b,0,6 = \(\frac{6}{10}\)=\(\frac{3}{5}\)

0,05=\(\frac{5}{100}\)=\(\frac{1}{20}\)

c, 1,2=\(\frac{12}{10}\)=\(\frac{6}{5}\)

0,25= \(\frac{25}{100}\)=\(\frac{1}{4}\)

d, 2,5 = \(\frac{25}{10}\)=\(\frac{5}{2}\)

0,75 = \(\frac{75}{100}\)= \(\frac{3}{4}\)

\(0,75=\dfrac{75}{100}=\dfrac{75:25}{100:25}=\dfrac{3}{4}\\ 0,8=\dfrac{8}{10}=\dfrac{8:2}{10:2}=\dfrac{4}{5}\\ 2,15=\dfrac{215}{100}=\dfrac{215:5}{100:5}=\dfrac{43}{20}\)

A) \(0,75=\dfrac{75}{100}=\dfrac{75:25}{100:25}=\dfrac{3}{4}\)

B) \(0,8=\dfrac{8}{10}=\dfrac{8:2}{10:2}=\dfrac{4}{5}\)

C) \(2,15=\dfrac{215}{100}=\dfrac{215:5}{100:5}=\dfrac{43}{20}\)

a) \(0,75=\dfrac{3}{4}\)

b) \(0,8=\dfrac{4}{5}\)

c) \(2,15=\dfrac{43}{20}\)

0,(4)=4/9

1,(2)=11/9

0,0(8)=4/45

0,1(2)=11/90