直接寫出得數(shù)
7
10
-
5
10
=
4
7
+
2
7
=
1
5
+
3
5
=
3
4
+
1
4
=
1
3
+
1
3
=
8
9
-
2
9
=
1
3
+
1
3
=
5
7
-
3
7
=
1-
7
8
=
5
6
-
1
6
=
1
4
+
2
4
=
1-
3
5
=
7
9
-
5
9
=
2
8
+
6
8
=
1
2
+
1
2
=
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:
7
10
-
5
10
=
1
5
,
4
7
+
2
7
=
6
7
,
1
5
+
3
5
=
4
5
,
3
4
+
1
4
=1,
1
3
+
1
3
=
2
3
,
8
9
-
2
9
=
2
3
,
1
3
+
1
3
=
2
3
,
5
7
-
3
7
=
2
7
,
1-
7
8
=
1
8
,
5
6
-
1
6
=
2
3
,
1
4
+
2
4
=
3
4
,
1-
3
5
=
2
5
,
7
9
-
5
9
=
2
9
,
2
8
+
6
8
=1,
1
2
+
1
2
=1.
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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