试题与答案

已知,二次函数f(x)=ax2+bx+c及一次函数g(x)=-bx,其中a、b

题型:解答题

题目:

已知,二次函数f(x)=ax2+bx+c及一次函数g(x)=-bx,其中a、b、c∈R,a>b>c,a+b+c=0.

(Ⅰ)求证:f(x)及g(x)两函数图象相交于相异两点;

(Ⅱ)设f(x)、g(x)两图象交于A、B两点,当AB线段在x轴上射影为A1B1时,试求|A1B1|的取值范围.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析: 如果关系R的每一个属性都是不可分解的,则称R为第一范式的模式,因为属性部门成员可以再分解,所以不满足第一范式。

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Fashion is always c 小题7: . It means that people who want to be fashionable have to buy new clothes every few months, though(虽然) they only wear last month’s clothes a few t 小题8: . Some people have too m___小题9:___ clothes, but they seldom wear some of these clothes. These clothes are not in fashion any m 小题10: though they are still new.

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