x^2=2y+5,y^2=2x+5,求 x^3+2(xy)^2+y^3我的答案是15和-37?是吗?

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 求(X+Y)(X-Y)(X²+Y²),X=5 Y=2, (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 5X+Y=3 X+5Y=2 求x和y.5X+Y=3X+5Y=2求x和y. x*x+y*y-2x+4y+5=0求x, 求dy/dx=(x-y+5)/(x+y-2) y=x^3-5x^2+2x-8 求y^2求y撇 6x+5Y=31 2X+3Y=17求X求 Y 若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值 如果X,Y为有理数,且X,Y满足条件/ X /=5,/ y /=2,/ x-y /=x-y ,求X+2Y的值. 如果x,y表示有理数,且x,y满足条件/x/=5,/y/=2,/x-y/=y-x,求x+2y的值.呜呜, x.y是有理数且x.y满足条件|x|=5|y|=2|x-y|=y-x.求x+2y的 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值 若x-y分之x+y=3,求式子x+y分之5(x-y)—2（x-y）分之x+y的值