3
5
+
1
5
=
3
4
-
3
4
=
1-
1
3
=
7
9
-
2
9
=
2
7
+
3
7
=
6
9
+
1
9
=
分析:根據(jù)同分母分數(shù)加減法的計算方法進行計算.
解答:解:
3
5
+
1
5
=
4
5
3
4
-
3
4
=0
1-
1
3
=
2
3
7
9
-
2
9
=
5
9
2
7
+
3
7
=
5
7
6
9
+
1
9
=
7
9
點評:同分母分數(shù)相加減,分母不變,只把分子相加減.
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