Câu 5.
a)
- $\frac{2}{-5}$ = $\frac{-16}{40}$
- $\frac{-3}{8}$ = $\frac{-15}{40}$
Có: $\frac{-16}{40}$ < $\frac{-15}{40}$
=> $\frac{2}{-5}$ < $\frac{-3}{8}$
b) -0,85 và $\frac{-17}{20}$;
- -0,85 = $-\frac{85}{100}$ = $-\frac{17}{20}$
=> -0,85 = $-\frac{17}{20}$
c) $\frac{-137}{200}$ và $\frac{37}{-25}$;
- $\frac{37}{-25}$ = $-\frac{148}{100}$
Có: $\frac{-137}{200}$ > $-\frac{148}{100}$
=> $\frac{-137}{200}$ > $\frac{37}{-25}$
d) $-1\frac{3}{10}$ và $-(\frac{-13}{-10})$;
- $-1\frac{3}{10}$ = $-\frac{13}{10}$
- $-(\frac{-13}{-10})$ = $-\frac{13}{10}$
Có: $-\frac{13}{10}$ = $-\frac{13}{10}$
=> $-1\frac{3}{10}$ = $-(\frac{-13}{-10})$