Question

Giúp vs!!

Answer 1

\(\left(\dfrac{1}{4}+\dfrac{3}{4}\right)+\left(\dfrac{2}{5}+\dfrac{3}{5}\right)=\dfrac{4}{4}+\dfrac{5}{5}=1+1=2\)

Answer 2

=(1/4 + 3/4) + (2/5 + 3/5)
=     1           +       1
=                   2

Answer 3

\(\dfrac{1}{4}+\dfrac{2}{5}+\dfrac{3}{4}+\dfrac{3}{5}=\left(\dfrac{1}{4}+\dfrac{3}{4}\right)+\left(\dfrac{2}{5}+\dfrac{3}{5}\right)=1+1=2\)