题目

脱式计算。0.4×（3.2-0.8）÷1.2          5×[（3.24+4.06）÷6.05]7.4×1.3-4.68÷0.9             [10-（0.2+16.7×0.07）]÷0.01 答案：解：0.4×(3.2-0.8)÷1.2=0.4×2.4÷1.2=0.96÷1.2=0.85×[(3.24+4.06)÷6.05]=5×(7.3÷6.05)=5×1.206=6.037.4×1.3-4.68÷0.9=9.62-5.21=4.41[10-(0.2+16.7×0.07)]÷0.01=[10-(0.2+1.169)]÷0.01=(10-1.369)÷0.01=8.631÷0.01=863.1

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