已知,xy满足y²=-x²+2x-5/4-y,代数式xy/x+y=
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/27 17:54:38
![已知,xy满足y²=-x²+2x-5/4-y,代数式xy/x+y=](/uploads/image/z/6885564-60-4.jpg?t=%E5%B7%B2%E7%9F%A5%2Cxy%E6%BB%A1%E8%B6%B3y%26%23178%3B%3D-x%26%23178%3B%2B2x-5%2F4-y%2C%E4%BB%A3%E6%95%B0%E5%BC%8Fxy%2Fx%2By%3D)
已知,xy满足y²=-x²+2x-5/4-y,代数式xy/x+y=
已知,xy满足y²=-x²+2x-5/4-y,代数式xy/x+y=
已知,xy满足y²=-x²+2x-5/4-y,代数式xy/x+y=
y²=-x²+2x-5/4-y,
——》(y+1/2)^2+(x-1)^2=0,
——》x=1,y=-1/2,
——》xy/(x+y)=1*(-1/2)/(1-1/2)=-1.