Question

Tính (tính nhanh) 5/3+(−2/7)−(−1,2)

Answer 1

`5/3+(−2/7)−(−1,2)`

`=5/3-2/7+1,2`

`=5/3-2/7+6/5`

`=175/105-30/105+126/105`

`=271/105`

 

Answer 2

\(\dfrac{5}{3}+\dfrac{-2}{7}-\left(-1,2\right)\)

\(=\dfrac{5}{3}+\dfrac{-2}{7}+1,2\)

\(=\dfrac{5}{3}-\dfrac{2}{7}+\dfrac{6}{5}\)

\(=\dfrac{175}{105}-\dfrac{30}{105}+\dfrac{126}{105}\)

\(=\dfrac{175-30+126}{105}\)

\(=\dfrac{271}{105}\)