已知x²+2xy-8y²=0(y≠0),求(x-y)/(x+y)的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/01 03:43:14
![已知x²+2xy-8y²=0(y≠0),求(x-y)/(x+y)的值](/uploads/image/z/7085875-67-5.jpg?t=%E5%B7%B2%E7%9F%A5x%26%23178%3B%2B2xy-8y%26%23178%3B%3D0%28y%E2%89%A00%29%2C%E6%B1%82%28x-y%29%2F%28x%2By%29%E7%9A%84%E5%80%BC)
x){}K+Ԕ
-**u-*![G4umlҨЭרЮ|>i"}5Ph7~m`%v>ٽɮ{:*M*t@,[g
Ov/5|1֨,d'okZkU07]y>L!P~qAb
a
已知x²+2xy-8y²=0(y≠0),求(x-y)/(x+y)的值
已知x²+2xy-8y²=0(y≠0),求(x-y)/(x+y)的值
已知x²+2xy-8y²=0(y≠0),求(x-y)/(x+y)的值
x²+2xy-8y²=0(y≠0),
等价于(x+4y)(x-2y)=0
所以x=-4y或x=2y
(x-y)/(x+y)
=-5y/-3y
= 5/3
或
(x-y)/(x+y)
=y/3y
=1/3