(1)证明:∵四边形ABCD是矩形,
∴CD∥AB,
∴CD∥BQ,
∴△DCP∽△QBP;
(2)解:∵四边形ABCD是矩形,
∴AB=CD,AB∥CD,AD=BC,AD∥BC,
∴△DCP∽△QBP,
∴BQ
线段有限长,直线无限长.
4与9的等比中项是____ .
I woke up with______ bad headache, yet by______ evening the pain had gone.