`11/50 . (-17 1/2) - 11/50 .82 1/2`
`= 11/50 . (-17 1/2 - 82 1/2)`
`=11/50 .` \(\left[\left(-17-82\right)\left(\dfrac{1}{2}-\dfrac{1}{2}\right)\right]\)
`=11/50 . (-100)`
`=-1100/50`
`=-22`
`11/50 . (-17 1/2) - 11/50 . 82 1/2`
`= 11/50 . (-35/2) - 11/50 . 165/2`
`= 11/50 . [(-35/2) - 165/2)`
`= 11/50 . (-100)`
`= -22`