问题 解答题
计算下面各题,能简便计算的要简便计算.
8
3
×
7
5
÷
8
3
×
7
5
5
6
×13-
5
6
9
10
÷〔
3
4
×(1-
2
5
)〕
7
9
÷
11
5
+
2
9
×
5
11
9
8
-
5
7
-
2
7
1
2
-
4
25
÷
2
5
答案

(1)

8
3
×
7
5
÷
8
3
×
7
5

=(

8
3
÷
8
3
)×(
7
5
×
7
5
),

=1×

49
25

=1

24
25

(2)

5
6
×13-
5
6

=

5
6
×(13-1),

=

5
6
×12,

=10;

(3)

9
10
÷〔
3
4
×(1-
2
5
)〕,

=

9
10
÷〔
3
4
×
3
5
〕,

=

9
10
÷
9
20

=2;

(4)

7
9
÷
11
5
+
2
9
×
5
11

=(

7
9
+
2
9
)×
5
11

=1×

5
11

=

5
11

(5)

9
8
-
5
7
-
2
7

=

9
8
-(
5
7
+
2
7
),

=

9
8
-1,

=

1
8

(6)

1
2
-
4
25
÷
2
5

=

1
2
-
2
5

=

1
10

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