1
2
+
1
3
=
1
2
-
1
4
=
2
5
-
1
5
=
4
7
-
1
7
=
7
8
-
3
8
=
1
10
+
2
5
=
5
6
-
2
3
=
1
3
+
1
5
=
3
8
-
1
4
=
2
3
+
1
3
=
3
8
+
3
8
=
1
2
-
1
5
=
4
7
+
3
7
=		 1-
7
8
=
5
6
+
5
6
=
1-
5
12
=
3
5
+
1
2
=
9
10
-
3
10
=
5
7
-
5
7
=
3
8
+
5
8
=
分析：根據(jù)分數(shù)加減法的計算方法進行計算．
解答：
解：
1
2
+
1
3
=
5
6
，
1
2
-
1
4
=
1
4
，
2
5
-
1
5
=
1
5
，
4
7
-
1
7
=
3
7
，
7
8
-
3
8
=
1
2
，
1
10
+
2
5
=
1
2
，
5
6
-
2
3
=
1
6
，
1
3
+
1
5
=
8
15
，
3
8
-
1
4
=
1
8
，
2
3
+
1
3
=1，
3
8
+
3
8
=
3
4
，
1
2
-
1
5
=
3
10
，
4
7
+
3
7
=1，		 1-
7
8
=
1
8
，
5
6
+
5
6
=
5
3
，
1-
5
12
=
7
12
，
3
5
+
1
2
=
11
10
，
9
10
-
3
10
=
3
5
，
5
7
-
5
7
=0，
3
8
+
5
8
=1．
點評：同分母分數(shù)相加減，分母不變，只把分子相加減；
異分母分數(shù)相加減，先通分，然后再按照同分母分數(shù)加減法進行計算．
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