题目

听下面一段对话，回答问题。 （1） Who is Mrs. Jones? A . Joe and Leo's neighbor. B . Joe and Leo's mother. C . Joe and Leo's teacher. （2） What would Joe and Leo never do again? A . Tell lies. B . Make noise. C . Fight. 答案：C B化简求值：（1）已知x=-2，求的值；（2）已知x=，求3x2+5xy+3y2的值．