30:6+12:2=11
24:6+12:4=7
25:5-14:7=3
2*8+12=28
27+3:3=28
(18+2):2=10
30-3*9=3
90-18=72 72:9=8 Ответ:8 8*9=72 72+18=90
4 7/15 + 8 8/15 - 6 14/15 = (67+128-104)/15 = 91/15 = 6 1/15
(4 21/23 + 6 8/23) - 3 21/23 = (113+143)/23 - 90/23 = 256/23 - 90/23 = 166/23 = 7 5/23
53-(3*9+4*6)=2
(53-3*9)+4*6=50
(53-3*9+4)*6=180
(53-3)*9+4*6=474