已知动圆C与圆及圆都内切,则动圆圆心C的轨迹方程为 .
已知Rt△ABC中,∠C=,AC=,BC=1,若以C为圆心,CB为半径的圆交AB于点P,则AP=_____________.
已知二次函数图象过点A(2,1)、B(4,1)且最大值为2,则二次函数的解析式为 .
如图,△ABC中,BD平分∠ABC, ADBD于D, F为AC中点,AB =" 5," BC =" 7," 则DF = .
分解因式= .
不等式组的整数解为 .