Đáp án:
@`mon1611`
$\frac{-3}{5}$+ $\frac{28.43}{5.56}$ + $\frac{28.5}{5.24}$ - $\frac{28.21}{5.63}$
= $\frac{-3}{5}$ + $\frac{2.2.7.43}{5.2.2.7.2}$ + $\frac{2.2.7.5}{2.2.2.3.5}$ - $\frac{2.2.7.3.7}{5.7.3.3}$
= $\frac{-3}{5}$ + $\frac{43}{5.2}$ + $\frac{7}{2.3}$ - $\frac{28}{15}$
= $\frac{-3}{5}$ + $\frac{43}{10}$ + $\frac{7}{6}$ - $\frac{28}{15}$
= $\frac{-18}{30}$ + $\frac{129}{30}$ + $\frac{35}{30}$ - $\frac{56}{30}$
= $\frac{-18+129+35-56}{30}$
= $\frac{90}{30}$
= 3
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