A:加速向B
B:加速离开B
C:减速向B
D:静止不动
已知点P(3,4)在椭圆x2a2+y2b2=1上,则以点P为顶点的椭圆的内接矩形PABC的面积是( )
I want to _______a bike in the park .
(4x+5x2−1−3x−1)÷x+2x2−2x+1 ,其中x=3.