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(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)=
56:(60-30-21-1)=
56:(30-21-1)=
56:(9-1)=
56:8=
7
(24+6×2):4+7-(28-12:3):6=
(24+12):4+7-(28-4):6=
36:4+7-24:6=
9+7-4=
16-4=
12
(54:6×3-6×2):3=
(9×3-12):3=
(27-12):3=
15:3=
5
(2×3×3):2×(45:9+72:8-16:2)=
(6×3):2×(5+9-8)=
18:2×(14-8)=
9×6=
54
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)-18=
19+24-18=
43-18=
25
