计算下面各题(怎样简便怎样算):
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/27 18:04:20
计算下面各题(怎样简便怎样算):
18.3-7.4-2.6
1-
18.3-7.4-2.6
1-
8 |
15 |
![计算下面各题(怎样简便怎样算):](/uploads/image/z/19312466-50-6.jpg?t=%E8%AE%A1%E7%AE%97%E4%B8%8B%E9%9D%A2%E5%90%84%E9%A2%98%EF%BC%88%E6%80%8E%E6%A0%B7%E7%AE%80%E4%BE%BF%E6%80%8E%E6%A0%B7%E7%AE%97%EF%BC%89%EF%BC%9A)
(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
5÷
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.
=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
5÷
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.