Question

tính bằng cách thuận tiện nhất : 4/5 + 4 + 11/5

Answer 1

`4/5 +4+11/5`

`=(4/5 +11/5)+4`

`= 15/5 +4`

`=3+4`

`=7`

Answer 2

\(\dfrac{4}{5}+4+\dfrac{11}{5}\\ =\left(\dfrac{4}{5}+\dfrac{11}{5}\right)+4\\ =\dfrac{11+4}{5}+4\\ =\dfrac{15}{5}+4\\ =3+4=7\)

Answer 3

\(\dfrac{4}{5}\) + 4 + \(\dfrac{11}{5}\)

= ( \(\dfrac{4}{5}\) + \(\dfrac{11}{5}\)) + 4

= \(\dfrac{15}{5}\) + 4

= 3 + 4

= 7

Answer 4

4/5+4+11/5

=(4/5+11/5)+4

=15/5+4

=3+4=7