问题 解答题
5
11
-(
1
7
-
6
11
7
4
-
5
6
)÷
1
12
3
10
+(
4
7
+
1
2
)×
7
25
1
2
-(
3
4
-
3
5
)〕÷
7
10
答案

(1)

5
11
-(
1
7
-
6
11
),

=

5
11
-
1
7
+
6
11

=

5
11
+
6
11
-
1
7

=1-

1
7

=

6
7

(2)(

7
4
-
5
6
)÷
1
12

=(

7
4
-
5
6
)×12,

=

7
4
×12-
5
6
×12,

=21-10,

=11;

(3)

3
10
+(
4
7
+
1
2
)×
7
25

=

3
10
+
4
7
×
7
25
+
1
2
×
7
25

=

3
10
+
4
25
+
7
50

=

15
50
+
8
50
+
7
50

=

3
5

(4)[

1
2
-(
3
4
-
3
5
)]÷
7
10

=[

1
2
-
3
20
7
10

=

7
20
÷
7
10

=

1
2

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