题目内容

计算
(1)
13
5
×8×
8
13
×1.25
(2)1
4
5
×1.25+1
1
4
×2.2-1
1
4

(3)
3
8
÷〔(
1
5
+
1
4
)×
3
8

(4)7.8÷[32×(1-
5
8
)+3.6].
(1)
13
5
×8×
8
13
×1.25,
=(
13
5
×
8
13
)×(8×1.25),
=
8
5
×10,
=16;

(2)1
4
5
×1.25+1
1
4
×2.2-1
1
4

=1.8×1.25+1.25×2.2-1.25×1,
=(1.8+2.2-1)×1.25,
=3×1.25,
=3.75;

(3)
3
8
÷[(
1
5
+
1
4
)×
3
8
],
=
3
8
÷[
9
20
×
3
8
],
=
3
8
×
160
27

=
20
9


(4)7.8÷[32×(1-
5
8
)+3.6],
=7.8÷[32×
3
8
+3.6],
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5.
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