题目内容

计算下面各题,能简算的要简算.
4
5
-(
1
3
-
1
5
)
3
10
+
2
5
+
9
10
1
2
+(
5
6
-
3
4
)
27
28
-
1
7
-
9
14
.
(1)
4
5
-(
1
3
-
1
5
)
=
4
5
+
1
5
-
1
3

=1-
1
3

=
2
3
;

(2)
3
10
+
2
5
+
9
10

=
7
10
+
9
10

=1
3
5
;

(3)
1
2
+
(
5
6
-
3
4
)
=
1
2
+
1
12

=
7
12
;

(4)
27
28
-
1
7
-
9
14

=
23
28
-
9
14

=
5
28
.
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