b) `74 19/35 . 7/90 + 15 16/35 . 7/90 + 2 14/90`
`=7/90 ( 74 19/35 + 15 16/35) + 2 14/90`
`= 7/90 ( 74 + 19/35+ 15+16/35) + 2 14/90`
`= 7/90 ( 89 + 1) + 2 14/90`
`= 7/90 . 90 + 2 14/90`
`= 7 + 2 + 14/90`
`= 9 + 14/90`
`=412/45`
c) `-5/17 . 2/9 + 7/17 . (-5/9) + 2010 5/17`
`= -5/9 . 2/17 + 7/17 . (-5/9) + 2010 5/17`
`= -5/9 ( 2/17 + 7/17) + 2010 5/17`
`= -5/9 . 9/17 + 2010 + 5/17`
`= -5/17 + 2010 + 5/17`
`= (-5/17 + 5/17)+2010`
`= 2010`
