等于()。
A.0
B.
C.
D.1
参考答案:A
已知:抛物线y=x2-2mx+m2+2m-1,随着m取值的不同,抛物线的顶点坐标也将发生变化,请你通过计算说明,不论m取任何实数,抛物线的顶点都在一条固定的直线上.
—_____?
—It's eight. [ ]
A. What day is it
B. What's five and three
C. How old are you
D. What's your telephone number