`1 1/2 + 1 1/3 = ( 1 + 1) + ( 1/2 + 1/3) = 2 + 5/6 = 2 5/6 = 17/6`
`2 2/3 - 1 4/7 = (2 -1) + ( 2/3 - 4/7) = 1 + ( 14/21 - 12/21) = 1 + 2/21 = 1 2/21 = 23/21`
`3 2/5 xx 6 3/4 = 17/5 xx 27/4 = 459/20`
`3 1/2 : 2 1/4 = 7/2 : 9/4 = 7/2 xx 4/9 = 14/9`
\(1\)\(\dfrac{\text{ 1}}{2}+1\dfrac{1}{3}=\dfrac{3}{2}+\dfrac{4}{3}=\dfrac{17}{6}\)
\(2\)\(\dfrac{\text{2}}{3}-1\dfrac{4}{7}=\dfrac{8}{3}-\dfrac{11}{7}=\dfrac{23}{21}\)
\(3\)\(\dfrac{\text{ 2}}{5}x6\dfrac{3}{4}=\dfrac{17}{5}x\dfrac{27}{4}=\dfrac{459}{20}\)
\(3\)\(\dfrac{\text{1}}{2}:2\dfrac{1}{4}=\dfrac{7}{2}:\dfrac{9}{4}=\dfrac{14}{9}\)