题目内容

计算下面各题,能简算的要简算
4
5
-(
1
8
+
1
4
)               
3
8
+
4
7
+
5
8

2
7
-(
2
7
-
1
8
)                
4
15
+
7
9
-
4
15
+
2
9
(1)
4
5
-(
1
8
+
1
4

=
4
5
-
3
8

=
17
40


(2)
3
8
+
4
7
+
5
8

=
3
8
+
5
8
+
4
7

=1+
4
7

=1
4
7


(3)
2
7
-(
2
7
-
1
8

=
2
7
-
2
7
+
1
8

=
1
8


(4)
4
15
+
7
9
-
4
15
+
2
9

=(
4
15
-
4
15
)+(
7
9
+
2
9
),
=0+1,
=1.
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