Question

数学一元2次方程公式法.帮忙解决一下.谢谢

Answer 1

因为x^2+7xy-60y^2=0.

所以(x-12y)(x+5y)=0

x=12y或x=-5y

x=12y时

x-y/x+y=(12y-y)/(12y+y)=11/13

x=-5y时

x-y/x+y=(-5y-y)/(-5y+y)=3/2

综上所述,x-y/x+y=11/13或3/2