3.9×5.5-3.9×4.5 20-7.12-4.13-6.75 4-3.25÷1.3×0.5 25+10.2÷（8.4-6.7）

题目

3.9×5.5-3.9×4.5 20-7.12-4.13-6.75 4-3.25÷1.3×0.5 25+10.2÷（8.4-6.7）
36×10.1 8.8×1.3+1.2×1.3 15×19.9 0.8×0.25×4×1.25
7.27÷4÷0.25 3.14×0.2+6.86×0.2

答案

1.3.9×5.5-3.9×4.5=3.9×(5.5-4.5)=3.92.20-7.12-4.13-6.75=20-(7.12+4.13)-6.75=20-(11.25+6.75)=20-18=23.4-3.25÷1.3×0.5=4-(3.9-0.65)÷1.3×0.5=4-(3.9÷1.3×0.5-0.65÷1.3×0.5)=4-(1.5-0.25)=4-1.25=2.75...