y=(ax+b)/(cx+d)在解析几何中表示双曲线方程,其中要求c≠0求中心时,可对原方程做恒等变形,y=(ax+b)/(cx+d)= [(a/c)(x+b/a)]/(x+d/c)=(a/c)[1-(ad-bc)/(ac)]/(x+d/c)=a/c-[(ad-bc)/c²]/(x+d/c) 令(ad-bc)/c²...