> 数学 >
用简便方法计算下面各题.
2
5
+
1
3
+
3
5
;          
1
4
+
1
3
+
1
4
+
2
3
;       
9
7
+
1
8
+
3
8
+
5
7
人气:454 ℃ 时间:2019-08-17 21:10:25
解答
(1)
2
5
+
1
3
+
3
5

=
2
5
+
3
5
+
1
3

=1+
1
3

=1
1
3

(2)
1
4
+
1
3
+
1
4
+
2
3

=
1
4
+
1
4
+(
2
3
+
1
3

=
1
2
+1
=1
1
2

(3)
9
7
+
1
8
+
3
8
+
5
7

=
9
7
+
5
7
+(
1
8
+
3
8

=2+
1
2

=2
1
2
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