题目

It’s my son’s birthday next week, and I have to do my best for that, ________? A. isn’t it         B. is it          C. haven’t I        D. don’t I   答案：D设命题p：函数f（x）=x2-2mx+1在[1，+∞）上是增函数，命题q：函数f（x）=lg（x2-mx+1）的定义域为R．（1）若m=2，试判断命题p的真假；（2）若命题p与命题q一真一假，试求实数m的取值范围．