问题 解答题
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].
答案

(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.

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