Va rog ajutatima si pe mine urgent

Răspuns:
a) (9/8·2/3+11/4):21/10=
[(18/24)⁶+11/4)]·10/21=
(3/4+11/4)·10/21=14/4·10/21=5/3
_________
b) (7/5+8/15·3/4):21/10=
(7/5+2/5)·10/21=
9/5·10/21=6/7
____________
c) =(2/5+6/5):(3·5+1)/5
8/5:16/5=
8/5·5/16=1/2