若(–x-y)(x^2+y^2)×A=x^4-y^4,则整式A为

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 若集合A={(x,y)|y>=|x-2|} ,B={(x,y)|y 已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 若2x-y=a,x+2y=a,则x：y=? 若2x+y+a,x-2y=a,则x/y=? 若(x+y)(x-y)^2-xy(x+y)=A(x+y),则A=什么 通分 a/(y-x)^2,b/(x-y)(x+y) 因式分解a(x-y)+b(y-x)+(2x-y) 若(–x-y)(x^2+y^2)×A=x^4-y^4,则整式A为 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 a^2(x-y)+(y-x)因式分解 已知x属于R,y>0,集合A={x|x*x+x+1,-x,-x-1},集合B={-y,-y/2,y+1}若A=B,则x*x+y*y的值为 若f(x+y,y/x)=x^2-y^2,则F(X,Y)= 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 若x*x+y*y=x+y-1/2,求x,y的值如题 a(x-y)(x+y)-b(y-x)(x+y)-c(x-y)^2(y+x)提取公因式 若2x=3y,则(x*x+y*y)/x*x=? A={（x,y)|y>=0.5|x-2|},B={(x,y)|y