Răspuns:
1. 35-21=14
2. 54-24=30
3.56-24=32
(7×5)=35 - 7×3=21 35 - 21 =14.
(6×9)=54-(6×4)=24. 54-24=30
(8×7)=56-(8×4)=32 54-32=22