题目内容

计算下面各题,注意使用计算简便.
5
6
-
3
10
+
1
6
-
7
10
5
7
+
1
4
-
5
7
5
8
-(
2
3
-
1
2
5
7
+
9
10
+
2
7
(1)
5
6
-
3
10
+
1
6
-
7
10

=(
5
6
+
1
6
)-(
3
10
+
7
10
),
=1-1,
=0;

(2)
5
7
+
1
4
-
5
7

=(
5
7
-
5
7
)+
1
4

=0+
1
4

=
1
4


(3)
5
8
-(
2
3
-
1
2
),
=
5
8
-
1
6

=
15
24
-
4
24

=
11
24


(4)
5
7
+
9
10
+
2
7

=(
5
7
+
2
7
)+
9
10

=1+
9
10

=1
9
10
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