【单选题】已知x,y为实数,且P(x,y)的坐标满足x 2 +y 2 =0,则点P必在( )
【单选题】已知点P 1 (x 1 ,y 1 )和P 2 (x 2 ,y 2 )都在反比例函数 y= 2 x 的图象上,若x 1 <x 2 <0,则( )
【单选题】已知实数x、y同时满足三个条件:①3x-2y=4-p,②4x-3y=2+p,③x>y,那么实数p的取值范围是( )
【单选题】When The Da Vinci Code was first published, Doubleday
A.
hoped that it would become a historic publication.
B.
only expected to sell no more than 85,000 copies.
C.
had great confidence in the book and its author.
D.
announced a conservative printing of the book.
【单选题】已知P 1 (x 1 ,y 1 ),P 2 (x 2 ,y 2 )是反比例函数 y= 2 x 的图象上的三点,且0<x 1 <x 2 ,则y 1 ,y 2 的大小关系是( )