Question

\(\frac{-5}{12}+\frac{1}{-4}\)

 

\(\frac{5}{12}+\frac{-3}{28}\)

 

\(\frac{-7}{15}+\frac{3}{35}\)

 

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

 

cộng ccas phân số ( rút gọn kết quả nếu có thể)

Answer 1

\(\frac{-5}{12}+\frac{-1}{4}=\frac{-5}{12}+\frac{-3}{12}=\frac{-5+-3}{12}=\frac{-8}{12}=\frac{-2}{3}\)

\(\frac{5}{12}+\frac{-3}{28}=\frac{35}{84}+\frac{-9}{84}=\frac{35+\left(-9\right)}{84}=\frac{26}{84}=\frac{13}{42}\)

\(\frac{-7}{15}+\frac{3}{35}=\frac{-49}{105}+\frac{9}{105}=\frac{-49+9}{105}=\frac{-40}{105}=\frac{-8}{21}\)

\(\frac{-5}{7}+\frac{-3}{4}=\frac{-20}{28}+\frac{-21}{28}=\frac{-20+\left(-21\right)}{28}=\frac{-41}{28}\)