`2 6/7 + 1 7/8`
`=20/7 + 15/8`
`=160/56 + 105/56`
`=265/56`
________________________
`5 4/5 - 1 2/3`
`=29/5 - 5/3`
`=87/15 - 25/15`
`=62/15`
_____________________________
`2 4/3 xx 1 1/2`
`=10/3 xx 3/2`
`=30/6`
`=5`
a \(\dfrac{20}{7}+\dfrac{15}{8}=\dfrac{160}{56}+\dfrac{105}{56}=\dfrac{265}{56}\)
b \(\dfrac{29}{5}-\dfrac{5}{3}=\dfrac{87}{15}-\dfrac{25}{15}=\dfrac{62}{15}\)
c \(\dfrac{10}{3}\times\dfrac{3}{2}=5\)