题目内容

计算下面各题,能简算的要简算.
1
2
+
1
5
-
1
4
4
3
-
1
8
+
7
12
2
9
+
4
5
+
7
9
+
1
5
2
3
-
5
6
+
1
3
⑤2-
2
7
-
5
7
5
6
-(
1
2
+
1
3
2
9
+(
3
4
-
1
2
1
9
+
1
8
+
8
9
1
2
+
1
5
-
1
4

=0.5+0.2-0.25
=0.45;

4
3
-
1
8
+
7
12

=
32
24
-
3
24
-
14
24

=
5
8


2
9
+
4
5
+
7
9
+
1
5

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

=1+1
=2;

2
3
-
5
6
+
1
3

=
2
3
+
1
3
-
5
6

=1-
5
6

=
1
6


⑤2-
2
7
-
5
7

=2-(
2
7
+
5
7

=2-1
=1;

5
6
-(
1
2
+
1
3

=
5
6
-
3
6
+
2
6

=
5
6
-
5
6

=0;

2
9
+(
3
4
-
1
2

=
2
9
+(
3
4
-
2
4

=
2
9
+
1
4

=
8
36
+
9
36

=
17
36



1
9
+
1
8
+
8
9

=(
1
9
+
8
9
+
1
8

=1
1
8
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