我国加入WTO后,根据达成的协议,若干年内某产品关税与市场供应量P的关系允许近似的满足:P(x)=2
(1-kt)(x-b)2(其中t为关税的税率,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224634115886795/SYS201311012246341158867019_ST/0.png)
).(x为市场价格,b、k为正常数),当t=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224634115886795/SYS201311012246341158867019_ST/1.png)
时的市场供应量曲线如图
(1)根据图象求k、b的值;
(2)若市场需求量为Q,它近似满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224634115886795/SYS201311012246341158867019_ST/2.png)
.当P=Q时的市场价格称为市场平衡价格.为使市场平衡价格控制在不低于9元,求税率t的最小值.
考点分析:
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