8.4×0.82÷4.2 0.8÷0.32×0.4 0.8×9.6×2.5÷2.4 13.2÷8.8×0.8 (8.91-6.82)+(1.09+3.18)

问题描述:

8.4×0.82÷4.2 0.8÷0.32×0.4 0.8×9.6×2.5÷2.4 13.2÷8.8×0.8 (8.91-6.82)+(1.09+3.18)
1.25×4.2÷(0.6÷8) 6×994+36 96+188×8 180+98×10 888+999 (16.8+1.4)÷0.7

8.4×0.82÷4.2 =(8.4÷4.2)×0.82=1.64;0.8÷0.32×0.4化成分数做;0.8×9.6×2.5÷2.4也是用约分比较好;9.6÷2.4=4,再×2.5×0.8=8;96+188×8=12×8+188×8=8×(12+188)=200×8=1600;13.2÷8.8×0.8这道题...但怎么啦~