《2025年一遍过五年级数学上册苏教版》

用简便方法计算下面各题。
1 $32.12÷ 1.25÷ 0.8$ 
2 $3.6× 0.75× 4.8÷ (1.5× 24× 0.18)$ 
3 $64× 75÷ 27× 81÷ 32÷ 25÷ 1.3× 3.9$ 
4 $1÷ (2÷ 3)÷ (3÷ 4)÷ (4÷ 5)$

答案： 1 32.12÷1.25÷0.8
=32.12÷(1.25×0.8)
=32.12÷1
=32.12
2 3.6×0.75×4.8÷(1.5×24×0.18)
=3.6×0.75×4.8÷1.5÷24÷0.18
=(3.6÷0.18)×(0.75÷1.5)×(4.8÷24)
=20×0.5×0.2
=2
3 64×75÷27×81÷32÷25÷1.3×3.9
=(64÷32)×(75÷25)×(81÷27)×(3.9÷1.3)
=2×3×3×3
=54
4 1÷(2÷3)÷(3÷4)÷(4÷5)
=1÷2×3÷3×4÷4×5
=1÷2×5
=2.5