请问方程x^2-xy+y^2+x-y-1=0是哪种曲线?怎样化简?怎么求对称轴?

请问方程x^2-xy+y^2+x-y-1=0是哪种曲线?怎样化简?怎么求对称轴? (x^2y^2+xy)dy/dx=1是伯努利方程,请问如何变形进行判断? .(x+y-2)(x+y-2xy)+(xy-1)^2 (x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1) 解方程xy'=(√x^2-y^2)+y 求解方程Y'X^2=XY-Y^2 化简分式方程:x*x-xy-y*y/x*x-3x-6y+2xy 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) {(x-y/x^2-2xy+y^2)-(xy+y^2/x^2-y^2)}*(xy/y-1) 整数x,y满足方程2xy+x+y=83,则x+y怎么算 解方程 x^2y^2+x^2+4xy+y^2+1=0 证明：代数式[(x+y)(x-y)-(x+y)^2-2y(x-y)-2xy]/xy 的值为x,y的值无关 解方程 (x+1)^5/(-1-x)^4=3x+7一定要100%正确阿. 解方程：（x^2+1)(y^2+1)=10 (x+y)(xy-1)=3 求方程(x+y)/(x^2-xy+y^2)=3/7的整数解1 {x-5=y+2 方程1{（x-5）（y+2）=xy 求方程x+y=x^2-xy+y^2+1的实数解 请问如何化简(4x-y)/x^2y^2 - (x+y)/xy^3 (-x-y)(x^2+xy+y^2)