直接寫出得數(shù).
3
4
+
1
2
=
1
3
-
1
4
=
12×
3
4
=
20÷
4
9
=
2
3
×
7
8
=
2
5
÷
3
2
=
2
13
=
1
2
÷
2
3
=
2
7
×14
=
1
5
÷3
=
分析:按照運(yùn)算法則直接運(yùn)算.
解答:解:
3
4
+
1
2
=
5
4
1
3
-
1
4
=
1
12
12×
3
4
=9
20÷
4
9
=45
2
3
×
7
8
=
7
12
2
5
÷
3
2
=
4
15
2
13
=0
1
2
÷
2
3
=
3
4
2
7
×14
=4
1
5
÷3
=
1
15
故答案為:
5
4
1
12
,9,45,
7
12
,
4
15
,0,
3
4
,4,
1
15
點(diǎn)評:本題是利用運(yùn)算法則直接運(yùn)算,注意結(jié)果化成最簡分?jǐn)?shù).
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