来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/08/24 12:22:11
(1)0.4×5.2+
2
5×2.2+40%×2.6
=0.4×5.2+0.4×2.2+0.4×2.6
=(5.2+2.2+2.6)×0.4
=10×0.4
=4
(2)27
18
19÷9
=(27+
18
19)×
1
9
=27×
1
9+
18
19×
1
9
=3+
2
19
=3
2
19;
(3)(
1
2-
3
8)÷(4÷
8
15)
=
1
8÷
15
2
=
1
60;
(4)
5
11×[(
2
5+
1
3)÷
5
6]
=
5
11×[
11
15÷
5
6]
=
5
11×
11
15×
5
6
=
1
3×
5
6
=
5
18.