脱式计算．35.6-5×1.730.4×（3.2-0.8）÷1.23.2×2.8+0.75×0.489.6-254.6÷3.80.25×1.68×40[（13.8-8.8）×3.2+3.8]÷0.9

Question

脱式计算． 35.6-5×1.7	30.4×（3.2-0.8）÷1.2
3.2×2.8+0.75×0.4	89.6-25
4.6÷3.8	0.25×1.68×40
[（13.8-8.8）×3.2+3.8]÷0.9

Answer 1

（1）35.6-5×1.7
=35.6-8.5
=27.1
（2）30.4×（3.2-0.8）÷1.2
=30.4×2.4÷1.2
=30.4×（2.4÷1.2）
=30.4×2
=60.8
（3）3.2×2.8+0.75×0.4
=8.96+0.3
=9.26
（4）89.6-25=64.6
（5）4.6÷3.8=(23)/(19)
（6）0.25×1.68×40
=0.25×40×1.68
=10×1.68
=16.8
（7）[（13.8-8.8）×3.2+3.8]÷0.9
=[5×3.2+3.8]÷0.9
=[16+3.8]÷0.9
=19.8÷0.9
=22