`(1)/(2):(3)/(4)+(1)/(6):(3)/(4)`
`=(1)/(2)xx(4)/(3)+(1)/(6)xx(4)/(3)`
`=(4)/(3)xx((1)/(2)+(1)/(6))`
`=(4)/(3)xx(3+1)/(6)`
`=(4)/(3)xx(4)/(6)`
`=(4)/(3)xx(2)/(3)`
`=(8)/(9)`
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\(=\dfrac{4}{3}\left(\dfrac{1}{2}+\dfrac{1}{6}\right)=\dfrac{4}{3}\cdot\dfrac{3+1}{6}=\dfrac{4}{3}\cdot\dfrac{4}{6}=\dfrac{14}{18}=\dfrac{7}{9}\)
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\(\dfrac{1}{2}:\dfrac{3}{4}+\dfrac{1}{6}:\dfrac{3}{4}=\left(\dfrac{1}{2}+\dfrac{1}{6}\right):\dfrac{3}{4}=\left(\dfrac{3}{6}+\dfrac{1}{6}\right):\dfrac{3}{4}=\dfrac{2}{3}:\dfrac{3}{4}=\dfrac{2}{3}.\dfrac{4}{3}=\dfrac{8}{9}\)
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