题目内容

脱式计算,能简算的要简算.
25×3.2×125
1
25
×99+
1
25
81
83
×82
4
7
×20+8÷
7
4
5×(
1
3
-
1
5
)÷
5
12
4
1
5
×8×2
1
7
(1)25×3.2×125
=25×4×(0.8×125)
=100×100
=10000;

(2)
1
25
×99+
1
25

=
1
25
×(99+1)
=
1
25
×100
=4;

(3)
81
83
×82
=
81
83
×(83-1)
=
81
83
×83-
81
83
×1
=81-
81
83

=80
2
83


(4)
4
7
×20+8÷
7
4

=
4
7
×20+8×
4
7

=
4
7
×(20+8)
=
4
7
×28
=16;

(5)5×(
1
3
-
1
5
)÷
5
12

=5×
2
15
×
12
5

=
8
5


(6)4
1
5
×8×2
1
7

=
21
5
×8×
15
7

=72.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网