问题 解答题
3
14
×
7
9
×
3
5
  
2
11
+
5
33
×3
3
4
×
4
5
+
1
5
×
3
4
 
1
2
×
4
5
-
1
10
7
4
×17+
3
4
×17 
39
50
-
1
2
-
1
3
-
1
6
20×(
1
4
-
1
5
+
1
2
)  
24×(
5
6
-
3
4
+
2
3
2
3
×
5
9
+
2
3
×
3
8
 
4
5
-
4
5
-
5
12
答案

(1)

3
14
×
7
9
×
3
5
=
1
10

(2)

2
11
+
5
33
×3,

=

2
11
+
5
11

=

7
11

(3)

3
4
×
4
5
+
1
5
×
3
4

=

3
4
×(
4
5
+
1
5
),

=

3
4
×1,

=

3
4

(4)

1
2
×
4
5
-
1
10

=

4
10
-
1
10

=

3
10

(5)

7
4
×17-
3
4
×17,

=(

7
4
-
3
4
)×17,

=1×17,

=17;

(6)

39
50
-
1
2
-
1
3
-
1
6

=

39
50
-(
1
2
+
1
3
+
1
6
),

=

39
50
-1,

=-

11
50

(7)20×(

1
4
-
1
5
+
1
2
),

=20×

1
4
-20×
1
5
+20×
1
2

=5-4+10,

=11;

(8)24×(

5
6
-
3
4
+
2
3
),

=24×

5
6
-24×
3
4
+24×
2
3

=20-18+16,

=18;

(9)

2
3
×
5
9
+
2
3
×
3
8

=

2
3
×(
5
9
+
3
8
),

=

2
3
×
67
72

=

67
108

(10)

4
5
-(
4
5
-
5
12

=

4
5
-
4
5
+
5
12

=

5
12

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