a)7 5/9 - 3 2/9+18/9 = b) 10 3/5-(2 2/5 - 3 4/5= c) (2 11/20 - 1 12/20) + ( 5 1/20 - 1 7/20) = d) (11 3/8 - 2 5/8) - (12 1/8 - 6 7/8=

HELPPP!​