题目内容

口算．
1
3
-
1
4
=
1
5
-
1
10
=
7
9
×
6
7
=
6
7
÷6=
12
13
×26=
1÷
5
6
=
3
4
÷
1
8
=		 28×
3
4
=
7
8
×
4
7
=
2
5
×99+
2
5
=
14÷
1
5
=		 (
2
3
-
1
2
)×12=		 1÷
1
4
×4=		 15×
1
3
=
1
3
+
2
13
×
13
14
=
分析：直接利用分数四则运算的计算法则计算出结果即可．
解答：
解：
1
3
-
1
4
=
1
12
1
5
-
1
10
=
1
10
7
9
×
6
7
=
2
3
6
7
÷6=
1
7
12
13
×26=24
1÷
5
6
=
6
5
3
4
÷
1
8
=6		 28×
3
4
=21
7
8
×
4
7
=
1
2
2
5
×99+
2
5
=40
14÷
1
5
=70		 (
2
3
-
1
2
)×12=2		 1÷
1
4
×4=16		 15×
1
3
=5
1
3
+
2
13
×
13
14
=
10
21
点评：此题考查分数四则运算的计算法则，注意计算结果的化简．
练习册系列答案
相关题目
口算．
13×5= 7×800= 72×3= 810÷9= 28÷2= 108×4=
91×4= 300÷5= 840÷4= 186÷6= 0×53= 35+47=
口算．
1
3
+
1
2
=
5
12
×4=
3
7
÷
3
7
=
3
20
×
4
9
=
15÷
1
2
=
2
3
÷8=		 0÷
1
100
=
3
5
-
1
6
=
口算．
1
3
+
1
4
=
1
5
-
1
6
=		 1-
5
8
=
1
4
+
1
5
=
2
7
+
1
3
=		 1-
7
15
=
3
4
-
1
6
=
7
10
-
1
2
=
3
8
-
1
4
=
5
9
-
4
9
=
1
2
-
1
4
=		 1-
13
13
=
口算．
1
3
×
3
5
=
5÷
1
3
=
2
5
×10=
0÷
2
3
=
2
5
+
3
5
=
3
8
÷
1
2
=		 1-
4
7
=
5
7
-
3
7
=
1
5
+
1
3
=		 1.8×3=
快速口算．
13×2=		 3×33= 32÷4=
56÷8= 5×9= 15÷7=
8×3÷6= 72÷8-9= 300-65=
135+80= 140+370= 83-15=

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