（本题13分）已知函数（1）已知一直线经过原点且与曲线相切，求的直线方程；（2）若关于的方程有两个不等的实根，求实数的取值范围。
She always buys me a nice present _________ she comes to see me .
Only after Mary read her composition the second time _________ the spelling mistake.
______ being fun and good exercise ,swimming is a very useful skill.
Come and see me whenever ____.
It is strange that he _________ in such an important examination .
经过原点
且与曲线
相切，求
的方程
有两个不等的实根，求实数
的取值范围。
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