作业帮 > 数学 > 作业

脱式计算. (1)45×(67+43) (2)3.68÷4.6+6.32 (3)72

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/04/29 03:50:02
脱式计算.
(1)45×(67+43) (2)3.68÷4.6+6.32 (3)
7
2
(1)45×(67+43)
=45×110
=4950;
(2)3.68÷4.6+6.32
=0.8+6.32
=7.12;
(3)
7

5

5
14
=
7

9

5
14
=
9
4;
(4)1.8×(4.7-3.87÷0.9)
=1.8×(4.7-4.3)
=1.8×0.4
=0.72;
(5)
1
5+(
1
4-
3
10×
2
3)
=
1
5+(
1
4-
1
5)
=
1
5-
1
5+
1
4
=
1
4;
(6)36÷[(
5
6-
1
3)×3]
=36÷[
1
2×3]
=36÷
3
2
=24.