直接寫出得數(shù).
3
4
+
1
4
=
5
6
-
1
6
=
2+
4
9
=
1-
5
9
=
1
5
+
1
4
=
1
2
-
1
3
=
2
3
+
1
6
=
4
5
-
3
5
=
1+
3
4
=
1
4
+
1
2
=
1+
1
3
=
2
3
-
1
6
=
分析:根據(jù)分?jǐn)?shù)加減法的計(jì)算方法進(jìn)行計(jì)算.
解答:解:
3
4
+
1
4
=1,
5
6
-
1
6
=
2
3
,
2+
4
9
=2
4
9
1-
5
9
=
4
9
,
1
5
+
1
4
=
9
20
1
2
-
1
3
=
1
6
,
2
3
+
1
6
=
5
6
,
4
5
-
3
5
=
1
5
,
1+
3
4
=1
3
4
,
1
4
+
1
2
=
3
4
,
1+
1
3
=1
1
3
2
3
-
1
6
=
1
2
點(diǎn)評(píng):口算時(shí),注意運(yùn)算符號(hào)和數(shù)據(jù),然后再進(jìn)一步計(jì)算.
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