A:重合
B:平行
C:相交
D:无法确定
选出恰当的应答语。
A.There was no computer room.
B.I looked it up on the Internet.
C.I went to Mountain Tai.
D.He tripped and fell in the race.
E.I went there by plane.
( 1 )____( 2 )____( 3 )____
( 4 )____( 5 )____
已知(﹣2xm+1y2n﹣1)•(5xnym)=﹣10x4y4,求﹣2m2n(﹣12m3n2)2的值.
如图,直线AB分别与两坐标轴交于点A(4,0).B(0,8),点C的坐标为(2,0). (1)求直线AB的解析式; (2)在线段AB上有一动点P. ①过点P分别作x,y轴的垂线,垂足分别为点E,F,若矩形OEPF的面积为6,求点P的坐标. ②连结CP,是否存在点P,使△ACP与△AOB相似,若存在,求出点P的坐标,若不存在,请说明理由.