Question

Tính hợp lý

-3/4 + 2/7 + -1/4 +3/5 +5/7

Answer 1

\(\frac{-3}{4}+\frac{2}{7}+\frac{-1}{4}+\frac{3}{5}+\frac{5}{7}\)

\(=(\frac{-3}{4}+\frac{-1}{4})+(\frac{2}{7}+\frac{5}{7})+\frac{3}{5}\)

\(=\frac{-4}{4}+\frac{7}{7}+\frac{3}{5}\)

\(=-1+1+\frac{3}{5}\)

\(=\frac{3}{5}\)

Chúc bạn học tốt!