` 3/5 + (-4/3) + (-3/4)`
` = 36/60 + (-80/60) + (-45/60)`
\(=\dfrac{36+\left(-80\right)+\left(-45\right)}{60}\)
\(=-\dfrac{89}{60}\)
`(-7/2) + (-2/3) + (-3/5)`
` = -105/30 + (-20/30) + (-18/30)`
\(=\dfrac{\left(-105\right)+\left(-20\right)+\left(-18\right)}{30}\)
\(=-\dfrac{143}{30}\)
=\(\dfrac{3}{5}-\dfrac{4}{3}-\dfrac{3}{4}\)
=\(\dfrac{-11}{5}-\dfrac{3}{4}\)
=-1\(\dfrac{29}{60}\)
chưa kịp làm câu b
Câu b
\(\dfrac{-7}{2}+\dfrac{-2}{3}+\dfrac{-3}{5}=\dfrac{-105}{30}+\dfrac{-20}{30}+\dfrac{-18}{30}=\dfrac{143}{30}\)
