a^2+b^2-10a-6b+34=0,求(a+b)/(a-b)的值
a^2+b^2-10a-6b+34=a^2-10a+25+b^2-6b+9=(a-5)^2+(b-3)^2=0
a=5,b=3
(a+b)/(a-b)=4