题目内容

计算下面各题.
4
7
-
2
7
=
2
6
+
1
6
=
3
9
+
6
9
=
1-
1
8
=
2
3
-
1
3
=
1
2
+
1
2
=
2
2
-
2
2
=
6
7
-
6
7
=
3
10
+
4
10
=
分析:同分母分数相加减,分母不变,分子相加减.
解答:解:
4
7
-
2
7
=
2
7
2
6
+
1
6
=
3
6
=
1
2
3
9
+
6
9
=1,
1-
1
8
=
7
8
2
3
-
1
3
=
1
3
1
2
+
1
2
=1,
2
2
-
2
2
=0,
6
7
-
6
7
=0,
3
10
+
4
10
=
7
10
点评:本题考查了同分母分数加减法计算的方法.
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