来源:学生作业帮 编辑:百度作业网作业帮 分类:数学作业 时间:2024/08/19 12:56:51
怎么简便怎么算
(5.9+1.65)÷0.25
4÷(
(1)(5.9+1.65)÷0.25,
=7.55÷0.25,
=30.2;
(2)4÷(
4
7+
4
5),
=4÷(
20
35+
28
35),
=4÷
48
35,
=4×
35
48,
=
35
12;
(3)
7
29×
3
8+
6
29×
7
12+
3
29×
7
9,
=
7
29×
3
8+
7
29×
6
12+
7
29×
3
9,
=(
3
8+
1
2+
1
3)×
7
29,
=(
9
24+
12
24+
8
24)×
7
29,
=
29
24×
7
29,
=
7
24.