问题 解答题
计算下列各题.
(1)
3
7
×
1
4
÷
3
4

(2)(25+
2
3
)×4
(3)(15-14×
4
7
)÷
8
21

(4)(
3
8
-25%)
×8÷
5
6
×
5
2
答案

(1)

3
7
×
1
4
÷
3
4

=

3
7
×
1
4
×
4
3

=

1
7

(2)(25+

2
3
)×4,

=25×4+

2
3
×4,

=100+2

2
3

=102

2
3

(3)(15-14×

4
7
)÷
8
21

=(15-8)÷

8
21

=7÷

8
21

=7×

21
8

=18

3
8

(4)(

3
8
-25%)×8÷
5
6
×
5
2

=(

3
8
×8-25%×8)÷
5
6
×
5
2

=(3-2)÷

5
6
×
5
2

=1×

6
5
×
5
2

=3.

操作题
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