Tina A group of us are going bowling on Tuesday night. Would you like to join us? Joe I really would, but unfortunately I have tennis lesson. Tina: Oh, that's too bad. ______ Joe Yes, for sure. Thanks for the offer.
【简答题】已知△OAB的顶点坐标为O(0,0),A(2,9),B(6,-3),点P的横坐标为14,且 OP =λ PB ,点Q是边AB上一点,且 OQ ? AP =0 . (1)求实数λ的值与点P的坐标; (2)求点Q的坐标; (3)若R为线段OQ上的一个动点,试求 RO ?( RA + RB ) 的取值范围.