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计算下面各题(怎样简便怎样算):

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/21 20:59:07
计算下面各题(怎样简便怎样算):
18.3-7.4-2.6   
1-
8
15
(1)18.3-7.4-2.6
=18.3-(7.4+2.6)
=18.3-10
=8.3;
(2)1-
8
15÷
4
5+
2
3
=1-
2
3+
2
3
=
1
3+
2
3
=1;
(3)(4×0.25-
3
5)÷
4
5
=(1-
3
5)÷
4
5
=
2

4
5
=
1
2;
(4)0.75×16+
3
4×5-75%
=0.75×16+0.75×5-0.75
=0.75×(16+5-1)
=0.75×20
=15.