题目

People like to tell me rubbish. Not just friends, but strangers ,too.   Once, at the airport, my husband stepped off an escalator(自动扶梯) before me. When he realized I wasn’t with him, he looked back and saw me hugging ( 拥抱) a stranger.I’d asked the man behind me: “Did you have fun in Vegas?”His answer broke me heart. After 50 years away, I’d come to say goodbye to the lover of his life, who was dying of cancer.“I should have married her 50 years ago,” he said. I hugged him, and then he was gone.Moments later, my husband said: “He told you all that on the escalator?已知关于x的方程x2-（k+1）x+k=0（1）求证：无论k取任何值，方程总有实数根．（2）若x=2是方程x2-（k+1）x+k=0的一个根，求k的值以及方程的另一个根．