直接寫得數(shù)
4
5
+
3
5
=
1
7
+
1
5
=
1
3
+0.25=
1
4
+
1
2
=
1-
9
14
=
2
5
+
2
3
-
2
5
=
分析:
2
5
+
2
3
-
2
5
運(yùn)用加法結(jié)合律簡(jiǎn)算;
1
3
+0.25先把小數(shù)化成分?jǐn)?shù)再計(jì)算;其它題目先通分再相加減.
解答:解:
4
5
+
3
5
=
7
5
,
1
7
+
1
5
=
12
35
,
1
3
+0.25=
7
12
,
1
4
+
1
2
=
3
4
,
1-
9
14
=
5
14
,
2
5
+
2
3
-
2
5
=
2
3
故答案為:
7
5
12
35
,
7
12
,
3
4
5
14
,
2
3
點(diǎn)評(píng):本題考查了基本的分?jǐn)?shù)的加減法,異分母分?jǐn)?shù)相加減先通分再根據(jù)同分母分?jǐn)?shù)相加減的方法計(jì)算.
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