题目内容

计算下面各题,能简算的要简算. 
1
2
+
1
5
-
1
4

3
4
-
1
8
+
7
12

2
9
+
4
5
+
7
9
+
1
5


2
3
+
1
3
-
5
6

3-
3
7
-
4
7

5
8
-(
5
8
-
1
2
)

(1)
1
2
+
1
5
-
1
4

=
7
10
-
1
4

=
9
20



(2)
3
4
-
1
8
+
7
12


=
5
8
+
7
12


=
29
24



(3)
2
9
+
4
5
+
7
9
+
1
5


=(
2
9
+
7
9
)+(
4
5
+
1
5
),

=1+1,
=2;


(4)
2
3
+
1
3
-
5
6


=1-
5
6


=
1
6



(5)3-
3
7
-
4
7


=3-(
3
7
+
4
7
),

=3-1,

=2;


(6)
5
8
-(
5
8
-
1
2
)

=
5
8
-
5
8
+
1
2

=
1
2
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