问题 解答题 2.1×0.3=0.56÷7=2.5×8×0.1=1÷0.25=0.1×3.9=0.5×2.3×2=3÷0.1=0.35÷0.35=1.8+1.2×5= 答案 2.1×0.3=0.630.56÷7=0.082.5×8×0.1=21÷0.25=40.1×3.9=0.390.5×2.3×2=2.33÷0.1=300.35÷0.35=1