问题
解答题
计算．
4×0.75+5.4×0.25
[12.8-（7.5+4.5）]×2.5．
答案
（1）4×0.75+5.4×0.25
=3+1.35
=4.35；
（2）[12.8-（7.5+4.5）]×2.5
=[12.8-12]×2.5
=0.8×2.5
=2．
搜题请搜索小程序“爱下问搜题”
计算．
4×0.75+5.4×0.25
[12.8-（7.5+4.5）]×2.5．
（1）4×0.75+5.4×0.25
=3+1.35
=4.35；
（2）[12.8-（7.5+4.5）]×2.5
=[12.8-12]×2.5
=0.8×2.5
=2．