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(1)1-
1
3
=
2
3
2
3
(2)
12
13
+
1
13
=
1
1
(3)
2
3
+
1
3
=
1
1
(4)
4
5
-
1
5
=
3
5
3
5
分析:根据同分母分数相加减的计算方法解答,分母不变分子相加减.
解答:解:
(1)1-
1
3
=
2
3
(2)
12
13
+
1
13
=1;
(3)
2
3
+
1
3
=1;
(4)
4
5
-
1
5
=
3
5
故答案为:
2
3
;1;1;
3
5
点评:本题考查了同分母分数相加减的计算方法:分母不变分子相加减,注意结果化成最简的数.
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