`15/24 - 6/26 + 28/48 - 30/39 + 10/24`
`=5/8 -3/13 + 7/12 - 10/13 + 5/12`
`=(-3/13 - 10/13) + (7/12 + 4/12) + 5/8`
`=-13/13 + 12/12 + 5/8`
`=-1+1+5/8`
`=0+5/8`
`=5/8`
________________________________
`4/3 - 3/5 + 7/3 + 2/5 - 1/3`
`=(4/3 + 7/3 - 1/3) + (-3/5 + 2/5)`
`=((4+7-1)/3) + ( (-3+2)/5)`
`=10/3 + (-1/5)`
`=10/3 - 1/5`
`=50/15 - 3/15`
`=47/15`
_______________________________
`5/7 . 5/11 + 5/7 . 2/11 - 5/7 . 14/11`
`=5/7 . (5/11 +2/11 - 14/11)`
`=5/7.` \(\left(\dfrac{5+2-14}{11}\right)\)
`=5/7 . (-7)/11`
`=(5.(-7))/(7.11)`
`=-5/11`
__________________________________
`2/5 . 1/3 - 2/15 : 1/5 + 3/5 . 1/3`
`=`\(\dfrac{2.1}{5.3}-\dfrac{2}{15}.5+\dfrac{3.1}{5.3}\)
`=2/15 - 2/3 + 1/5`
`=2/15 - 10/15 + 3/15`
`=(2-10+3)/15`
`=-5/15`
`=-1/3`
