`b) 32/15 . 3/8 - ( 7/20 - 3/4) . (-5/2)^2`
`= 4/5 - (-2/5) . 25/4`
`= 4/5 - (-5/2)`
`= 33/10`
``
`c) 3/8 . 9/22 - 7/22 . 3/8 + 1/11 . 5/8`
`= 3/8 . ( 9/22 - 7/22) + 1/11 . 5/8`
`= 3/8 . 1/11 + 1/11 . 5/8`
`= ( 3/8 + 5/8) . 1/11`
`= 1 . 1/11`
`= 1/11`