问题 解答题
细心计算每一步
1
9
+
3
6
-
1
3

5
6
-
1
3
+
1
4

7
8
+
1
4
-
1
3

5
6
-(
5
6
-
1
12

1
3
+
3
7
+
2
3
+
4
7

3
8
-
2
9
+
5
8
-
7
9
答案

(1)

1
9
+
3
6
-
1
3

=

2
18
+
9
18
-
6
18

=

11
18
-
6
18

=

5
18

(2)

5
6
-
1
3
+
1
4

=

1
2
+
1
4

=

3
4

(3)

7
8
+
1
4
-
1
3

=

9
8
-
1
3

=

27
24
-
8
24

=

19
24

(4)

5
6
-(
5
6
-
1
12
),

=

5
6
-
5
6
+
1
12

=0+

1
12

=

1
12

(5)

1
3
+
3
7
+
2
3
+
4
7

=(

1
3
+
2
3
)+(
3
7
+
4
7
),

=1+1,

=2;

(6)

3
8
-
2
9
+
5
8
-
7
9

=(

3
8
+
5
8
)-(
7
9
+
2
9
),

=1-1,

=0.

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