问题 解答题
计算,能简算的要简算.
7
8
+
5
12
-
1
6
17
24
-
3
8
-
1
12
5
9
+
7
15
+
8
15
+
1
9
5
9
-(
5
6
-
7
12
)
10-
2
9
-
7
9
1-
7
9
-(
3
4
-
1
6
)
答案

(1)

7
8
+
5
12
-
1
6

=

31
24
-
1
6

=1

1
8

(2)

17
24
-
3
8
-
1
12

=

8
24
-
1
12

=

1
4

(3)

5
9
+
7
15
+
8
15
+
1
9

=(

5
9
+
1
9
)+(
7
15
+
8
15
),

=

2
3
+1,

=1

2
3

(4)

5
9
-(
5
6
-
7
12
),

=

5
9
-
1
4

=

11
36

(5)10-

2
9
-
7
9

=10-(

2
9
+
7
9
),

=10-1,

=9;

(6)1-

7
9
-(
3
4
-
1
6
),

=1-

7
9
-
7
12

=

2
9
-
7
12

=-

13
36

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