Bună, cine ma poate ajuta?

(8×9-4÷2)-(91-9×9)=(72-2)-(91-81)=70-10=60
100-(27+7×6-48÷8)÷7=100-(27+42-6)÷7=100-(69-6)÷7=100-63÷7=100-9=91
(4×8+3×9+21)÷10÷(40-9×4)=(32+27+21)÷10÷(40-36)=(59+21)÷10÷4=80÷10÷4=8÷4=2
56÷(100-8×5-6×5-7×3-1)=56÷(100-40-30-21-1)=60-16-1)=56÷8=7
(24+6×2)÷4+7-(28-12÷3)÷6=(24+12)÷4+7-(28-4)=36÷4+7-24÷6=9-6=3
(54÷6×3-6×2)÷3=(27-12)÷3=15÷3=5
4×3+15-7×2+37-8×6=12+15-14+37-48=27-14+37-48=13+37-48=50-48=2
19+(6×7-18)-2×9=19+(42-18)-2×9=19+24-2×9=19+24-18=43-18=25
73-58+29-4=15+29-4=44-4=40