x+4y-2x+8y+5=0, (x-1)+（2y+2）=0 ∵(x-1)≥0,（2y+2）≥0 ∴(x-1)=0,（2y+2）=0 x=1,y= -1 代入x^4-y^4/2x+xy-y·2x-y/xy-y÷(x+y/y)即可求出
麻烦采纳,谢谢!