Ответ:

45-(5+2)*3=45-7*3=45-21=24

9+(3+6)*9= 9+9*9= 9+81= 90

100-35:(5+2)= 100+35:7 = 100+5= 105

9*8+54:9= 72+6= 78

35:7+63:9= 5+7= 12

45:9*6= 5*6= 30