24. Tて(x+y):(x-)) = 4 : 1頁,하 (x2 +y2 ) : (x2-y2)=? – InterviewSolution

1.	24. Tて(x+y):(x-)) = 4 : 1頁,하 (x2 +y2 ) : (x2-y2)=?
Answer» x+y=4x-4y5y=3xso x=5y/3(25y^2/9+y^2)/(25y^2/9-y^2)=34y^2/16y^2=17/8

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