`C = (-5/9) . (3/11) + (-13/18) . 3/11`
`= [(-5/9) +(-13/18)] . 3/11`
`=-23/18 . 3/11`
`=-23/66`
Vậy `C = -23/66`
``
`D =[ (2 + 2/15) . 9/17 . 3/32] : (-3/17)`
`= [32/15 . 9/17 . 3/32] . (-17/3)`
`=[ 96/85 . 3/32] . (-17/3)`
`= 9/85 . (-17)/3`
`=-3/5`
Vậy `D = -3/5`
`#caty09`