要用递等式计算，要用简便运算？

Question

如题所述

Answer 1

32×2.5×1.25
=4×8×2.5×1.25
=（4×2.5）×（8×1.25）
=10×10
=100
1.08×0.8÷0.27
=1.08÷0.27×0.8
=4×0.8
=3.2
28.9÷1.25÷0.8
=28.9÷（1.25×0.8）
=28.9÷1
=28.9
4.32×7.3+2.7×4.32
=4.32×（7.3+2.7）
=4.32×10
=43.2
（5.2-4.6）×4.25-0.8
=0.6×4.25-0.8
=2.5-0.8
=1.7
7.5×99
=7.5×（100-1）
=7.5×100-7.5×1
=750-7.5
=742.5

Answer 2

追答

把32分成4、8、32、在分别相乘

追问

要写在纸上

不是这样做的