Tính theo cách hợp lí: a/ $frac{4}{20}$ + $frac{16}{42}$ + $frac{6}{15}$ + $frac{-3}{5}$ + $frac{2}{21}$ + $frac{-10}{21}$ + $frac{3}{20}$ b/ $frac{42}{46}$ + $frac{250}{186}$ + $frac{-2121}{2323}$ + $frac{-125125}{143143}$

2025-01-17 14:58:34

Tính theo cách hợp lí: a/ $\frac{4}{20}$ + $\frac{16}{42}$ + $\frac{6}{15}$ + $\frac{-3}{5}$ + $\frac{2}{21}$ + $\frac{-10}{21}$ + $\frac{3}{20}$ b/ $\frac{42}{46}$ + $\frac{250}{186}$ + $\frac{-2121}{2323}$ + $\frac{-125125}{143143}$

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