直接寫(xiě)出得數(shù).
7
9
-
4
9
=
1
10
+
3
10
=
3
8
+
5
8
=
5
6
-
1
6
=
2
3
-
1
4
=
1
2
-
1
3
=
1-
2
7
=
1
2
+
1
6
=
分析:同分母分?jǐn)?shù)相加減,分母不變,只把分子相加減;異分母分?jǐn)?shù)相加減,先通分,化成同分母分?jǐn)?shù),然后再根據(jù)同分母分?jǐn)?shù)加減法的計(jì)算方法進(jìn)行計(jì)算.
解答:解:
7
9
-
4
9
=
1
3
1
10
+
3
10
=
2
5
3
8
+
5
8
=1
5
6
-
1
6
=
2
3
2
3
-
1
4
=
5
12
1
2
-
1
3
=
1
6
1-
2
7
=
5
7
1
2
+
1
6
=
2
3
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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