а) (a+d)/12=(30+5)/12=35/12=2 целых 11/12
б) с*d-29=17*5-29=85-29=56
в) a/d+87=30/5+87=6+87=93
г) 36/(b-a)=36/(42-30)=36/12=3
(a+d):12
(30+5):12=35/12= 2 11/12
cd-29
17*5-29=56
a:d+87
30:5+87=6+87=93
36:(b-a)
36:(42-30)=36:12=3
