1﹣1÷2=
2.5+3.8=
0.4×3.1×2.5=
1.85﹣+= 1÷×= +0.375=
2.4﹣= (+)×2.4= 5÷×5÷=
10×45%= 1.25×8= 40×(1﹣20%)=
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