早教吧 育儿知识 作业答案 考试题库 百科 知识分享

脱式计算,能简算的要简算.①2.55÷1.7-0.59②3.7×7.9+3.7×2.1③37×﹙45-23)÷514④34×93+6×0.75+75%

题目详情
脱式计算,能简算的要简算.
①2.55÷1.7-0.59     ②3.7×7.9+3.7×2.1     ③
3
7
×﹙
4
5
-
2
3
)÷
5
14
     ④
3
4
×93+6×0.75+75%
▼优质解答
答案和解析
①2.55÷1.7-0.59
=1.5-0.59
=0.91;
     
②3.7×7.9+3.7×2.1    
=3.7×(7.9+2.1)
=3.7×10
=37;

3
7
×﹙
4
5
-
2
3
)÷
5
14
   
=
3
7
×
2
15
×
14
5
  
=
4
25


3
4
×93+6×0.75+75%
=0.75×93+6×0.75+0.75
=0.75×(93+6+1)
=0.75×100
=75.