Răspuns:
121x3+BC+484:2=999-273
363+BC+242=726
363+BC=726-242
363+BC=484
BC=484-363
BC=121
(7×3+17×3):9×(612:4-b)=96
(21+51):9×(153-AC)=96
72:9×(152-AC)=96
8×(152-AC)=96
152-AC= 96:8
152-AC=12
AC=152-12
AC=140
(c:4+26×3):10-195:3=75
(AB:4+26×3):10-195=75×3
(AB:4+26×3):10-195=225
(AB:4+26×3):10=225+195
(AB:4+26×3):10=420
(AB:4+26×3)=420×10
AB:4+26×3=4200
AB:4+26=4200:3
AB:4+26=1400
AB:4=1400-26
AB:4=1374
AB=1374×4
AB=5396