1
2
+
1
4
=
1
2
-
1
4
=
1-
4
5
=
1
6
+
2
3
=
1
3
+
1
2
=
1
5
-
1
10
=
2
3
-
2
9
=
3
4
-
1
2
=
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
4
=
3
4
,
1
2
-
1
4
=
1
4
,
1-
4
5
=
1
5
,
1
6
+
2
3
=
5
6
1
3
+
1
2
=
5
6
,
1
5
-
1
10
=
1
10
2
3
-
2
9
=
4
9
,
3
4
-
1
2
=
1
4
點評:口算時,注意運算符號和數(shù)據(jù),然后再進一步計算.
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