A:are
B:were
C:i
D:will
____they____a new road one year ago?
(Ⅰ)求曲线C1与C2交点的坐标;
(Ⅱ)A、B两点分别在曲线C1与C2上,当|AB|最大时,求△OAB的面积(O为坐标原点).
一元二次方程x2﹣2x=0的根是( )