(25^2/12^2)-[(y-55)^2/b^2]=1

问题描述:

(25^2/12^2)-[(y-55)^2/b^2]=1
(13^2/12^2)-(y^2/b^2)=1

由第一式得:[(y-55)^2/b^2]=481/144由第二式得y^2/b^2=25/144两边开方得y/b=±5/12所以b=±12y/5将b=±12y/5代入[(y-55)^2/b^2]=481/144整理得:(y-55)/y=±√481/5所以y=±275(√481+5)/456所以b=±55(√481+5...