直接寫得數(shù):
1
3
-
1
5
=
7
15
+
4
15
=
3-
5
9
=
12
17
+
15
17
=
分析:同分母分數(shù)相加減,分母不變,分子相加減;異分母分數(shù)相加減,先通分,化成同分母的分數(shù),然后再計算.
解答:解:
1
3
-
1
5
=
2
15
7
15
+
4
15
=
11
15
,
3-
5
9
=2
4
9
,
12
17
+
15
17
=
27
17
故答案為:
2
15
,
11
15
,2
4
9
,
27
17
點評:本題考查了簡單的分數(shù)加減法,根據(jù)運算法則,快速的得出答案.
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