`1)(-2)/11+6/7+1/2+(-9)/11+1/7`
`= ((-2)/11 + (-9)/11) + (6/7 + 1/7) + 1/2`
` = -1 + 1 +1/2`
` = 0 + 1/2`
` = 1/2`
`2)(13/5+7/16)-(11/16-12/10)`
` = 13/5 + 7/16 - 11/16 + 12/10`
` = (13/5 + 12/10) + (7/16-11/16)`
` = (13/5 + 6/5) -1/4`
` = 19/5 - 1/4`
` = 71/20`