问题 解答题
3
8
+
2
3
+
5
12

27
28
-(
1
4
+
2
7
)

8-
3
17
-
14
17

5
6
-(
1
6
-
1
12
)

3
4
-
1
6
+
8
15

6
13
+
7
15
+
7
13
+
8
15
答案

(1)

3
8
+
2
3
+
5
12

=

3
8
+(
2
3
+
5
12
),

=

3
8
+
13
12

=

35
24

(2)

27
28
-(
1
4
+
2
7
),

=

27
28
-
15
28

=

6
14

(3)8-

3
17
-
14
17

=8-(

3
17
+
14
17
),

=8-1,

=7;

(4)

5
6
-(
1
6
-
1
12
),

=

5
6
-
1
6
+
1
12

=

4
6
+
1
12

=

3
4

(5)

3
4
-
1
6
+
8
15

=

7
12
+
8
15

=

67
60

(6)

6
13
+
7
15
+
7
13
+
8
15

=(

6
13
+
7
13
)+(
7
15
+
8
15
);

=1+1,

=2.

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