题目内容
停车场预计“十·一”国庆节这天将停放大小汽车1200辆次,该停车场的收费标准为:大车每辆次10元,小车每辆次5元.根据预计,解答下面的问题:
(1)写出国庆节这天停车场的收费金额y(元)与小车停放辆次x(辆)之间的函数关系式,并指出自变量x的取值范围;
(2)如果国庆节这天停放的小车辆次占停车总辆次的65%~85%,请你估计国庆节这天该停车场收费金额的范围.
(1)写出国庆节这天停车场的收费金额y(元)与小车停放辆次x(辆)之间的函数关系式,并指出自变量x的取值范围;
(2)如果国庆节这天停放的小车辆次占停车总辆次的65%~85%,请你估计国庆节这天该停车场收费金额的范围.
(1)
;(2)
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240250325051146.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824025032536767.png)
试题分析:(1)由题意可知,当小车停放辆次为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824025032552266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824025032567482.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824025032567310.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824025032552266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824025032552266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824025032552266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824025032567310.png)
试题解析:(1)依题得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240250325051146.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240250326611419.png)
而
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240250326771042.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824025032692587.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824025032708935.png)
即
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824025032536767.png)
答:估计国庆节这天该停车场收费金额的范围是[6900,8100]14分
![](http://thumb2018.1010pic.com/images/loading.gif)
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