Question

tính

3/7+(-18)/5+18/7+23/5

Answer 1

= 4

Answer 2

\(\dfrac{3}{7}+\dfrac{\left(-18\right)}{5}+\dfrac{18}{7}+\dfrac{23}{5}\)

\(=\left(\dfrac{3}{7}+\dfrac{18}{7}\right)+\left(\dfrac{-18}{5}+\dfrac{23}{5}\right)\)

\(=3+1\)

\(=4\)

Answer 3

= 4

Answer 4

4

Answer 5

   \(\dfrac{3}{7}+\dfrac{\left(-18\right)}{5}+\dfrac{18}{7}+\dfrac{23}{5}\)

\(=\left(\dfrac{3}{7}+\dfrac{18}{7}\right)+\left(\dfrac{\left(-18\right)}{5}+\dfrac{23}{5}\right)\)

\(=3+1\)

\(=4\)