题目内容

用简便方法计算.
5
16
+
1
3
+
3
16
5
12
-
2
5
+
7
12
7
8
-( 
3
8
+
1
3
(1)
5
16
+
1
3
+
3
16

=
5
16
+
3
16
+
1
3

=
1
2
+
1
3

=
5
6


(2)
5
12
-
2
5
+
7
12

=
5
12
+
7
12
-
2
5

=1-
2
5

=
3
5


(3)
7
8
-( 
3
8
+
1
3

=
7
8
-
3
8
-
1
3

=
1
2
-
1
3

=
1
6
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