18·9+32·9 75÷15-15÷5 3·(7·8+52) (12-4)·(80÷1) 24·7÷4-4·3 50-18·(64÷16)

18*9+32*9=450
75\15-15\5=2
3*(7*8+52)=324
(12-4)·(80÷1)=640
24·7÷4-4·3=30
50-18·(64÷16)=22

18*9+32*9=450
18*9=162
32*9=288
162+288=450
75/15-15/5=2
75/15=5
15/5=3
5-3=2
3*(7*8+52)=324
7*8=56
56+52=108
3*108=324
(12-4) *(80/1)=640
12-4=8
80/1=80
8*80=640
24*7/4-4*3=30
24*7=168
168/4=42
4*3=12
42-12=30
50 – 18 * (64 / 16) =  – 22
64/16=4
18*4=72
50-72=-22