题目

The campaign is trying to get the        across to young people that drugs are dangerous． A．lesson                     B．topic          C．message                 D．information 答案：C已知关于x的方程x2+mx+m-2=0.(1)若此方程的一个根为1,求m的值；(2)求证：不论m取何实数,此方程都有两个不相等的实数根.