直接寫得數(shù)
1
8
+
3
8
=
5
6
-
1
6
=
2
3
-
1
6
=
1
12
+
7
12
=
1
4
-
1
5
=
7+
4
7
=
1
3
+
1
4
=
2
3
+
1
5
=
1-
1
7
=
5
6
-
1
12
=
分析:根據(jù)分數(shù)加減法的計算方法進行計算.
解答:解:
1
8
+
3
8
=
1
2
5
6
-
1
6
=
2
3
,
2
3
-
1
6
=
1
2
,
1
12
+
7
12
=
2
3
,
1
4
-
1
5
=
1
20
,
7+
4
7
=7
4
7
,
1
3
+
1
4
=
7
12
,
2
3
+
1
5
=
13
15
1-
1
7
=
6
7
,
5
6
-
1
12
=
3
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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