问题 解答题
用递等式计算,能简算的要简算
14×75-624÷39
(7.6-3.6÷2)×1.5    
4
5
-
1
3
÷
7
15

5
7
÷9+
4
7
×
1
9
      
2
3
+(
5
6
-
3
4
3
8
       
7
11
÷[
2
5
-(1-
7
10
)]
答案

(1)14×75-624÷39

=150×7-208÷13,

=1050-16,

=1034;

(2)(7.6-3.6÷2)×1.5

=(7.6-1.8)×1.5,

=5.8×1.5,

=8.7;

(3)

4
5
-
1
3
÷
7
15

=

4
5
-
1
3
×
15
7

=

4
5
-
5
7

=

3
35

(4)

5
7
÷9+
4
7
×
1
9

=

5
7
×
1
9
+
4
7
×
1
9

=(

5
7
+
4
7
)×
1
9

=

9
7
×
1
9

=

1
7

(5)

2
3
+(
5
6
-
3
4
÷
3
8

=

2
3
+
1
12
×
8
3

=

2
3
+
2
9

=

8
9

(6)

7
11
÷[
2
5
-(1-
7
10
)]

=

7
11
÷[
2
5
-
3
10
],

=

7
11
÷
1
10

=

7
11
×10,

=

70
11

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