题目内容
李大柏养鸭的只数是鹅的2倍,养鸡的只数是鸭的2倍.
(1)分别画出表示养鸭、养鸡只数的线段图.
鹅:![](http://thumb.1010pic.com/pic3/upload/images/201205/46/484915b0.png)
;
鸭:![](http://thumb.1010pic.com/pic3/upload/images/201205/46/a00a30e7.png)
;
鸡:![](http://thumb.1010pic.com/pic3/upload/images/201205/46/ee99c6ef.png)
.
(2)鸡的只数是鹅的
(1)分别画出表示养鸭、养鸡只数的线段图.
鹅:
![](http://thumb.1010pic.com/pic3/upload/images/201205/46/484915b0.png)
![](http://thumb.1010pic.com/pic3/upload/images/201205/46/484915b0.png)
鸭:
![](http://thumb.1010pic.com/pic3/upload/images/201205/46/a00a30e7.png)
![](http://thumb.1010pic.com/pic3/upload/images/201205/46/a00a30e7.png)
鸡:
![](http://thumb.1010pic.com/pic3/upload/images/201205/46/ee99c6ef.png)
![](http://thumb.1010pic.com/pic3/upload/images/201205/46/ee99c6ef.png)
(2)鸡的只数是鹅的
4
4
倍.如果养鹅15只,养的鸡比鹅多45
45
只,养的鸡和鸭一共90
90
只.分析:(1)把鹅的只数看作1份,鸭的只数则是2份,鸡的只数则是4份,画出即可;
(2)鸡的只数是鹅的4倍,因为养鹅15只,根据求一个数的几倍,分别用乘法求出鸡、鸭和鹅的只数,根据题意,依次解答即可.
(2)鸡的只数是鹅的4倍,因为养鹅15只,根据求一个数的几倍,分别用乘法求出鸡、鸭和鹅的只数,根据题意,依次解答即可.
解答:解:(1)鹅:
;
鸭:
;
鸡:
;
(2)由图可知:鸡的只数是鹅的只数的4倍,
15×4-15=45(只),
15×2+15×4,
=30+60,
=90(只);
故答案为:4,45,90.
![](http://thumb.1010pic.com/pic3/upload/images/201205/46/484915b0.png)
鸭:
![](http://thumb.1010pic.com/pic3/upload/images/201205/46/a00a30e7.png)
鸡:
![](http://thumb.1010pic.com/pic3/upload/images/201205/46/ee99c6ef.png)
(2)由图可知:鸡的只数是鹅的只数的4倍,
15×4-15=45(只),
15×2+15×4,
=30+60,
=90(只);
故答案为:4,45,90.
点评:解答此题用到的知识点:求一个数的几倍用乘法解答.
![](http://thumb2018.1010pic.com/images/loading.gif)
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