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-2--31
2/3×2/3×2/3×2/3
2<()<()<3
1×9+2=1112×9+3=111
2/1×3/2×4/3
2+()=3+()
2/11×5/7×11/12
2+(2×5)=12
(+2)+(-11)
2(×-3)²=ײ-9
(-2)+(+30)-(-15)-(+27)
6×(2/18×7/30)
(-2)^2×(-3)^3
4×+2(11-×)=42
2/9×3/8÷6/7
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