(本小题满分7分)已知:关于的一元二次方程.(1)若方程有两个

(本小题满分7分)已知:关于的一元二次方程

(1)若方程有两个不相等的实数根,求的取值范围;

(2)在(1)的条件下,求证:无论取何值,抛物线y=总过轴上的一个固定点;

(3)若为正整数,且关于的一元二次方程有两个不相等的整数根,把抛物线y=向右平移4个单位长度,求平移后的抛物线的解析式.

 

答案

解:(1)∵关于的一元二次方程有两个不相等的实数根

>0   -------------- 1分

且m≠2       ------------------------------------------------------2分

(2)证明:令得,

 ---------------------------------------------------4分

 

∴抛物线与x轴的交点坐标为(),(

 

∴无论m取何值,抛物线y=总过x轴上的定点()------------------------------------------------------5分

(3)∵是整数  ∴只需是整数.

 

是正整数,且

.    --------------------------------------------- 6分

时,抛物线为

把它的图象向右平移4个单位长度,得到的抛物线解析式为

  -------------------------------------7分

解析:略

 

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