已知xy=8满足x.x.y-x.y.y-x+y=56.求x.x+y.y的值
已知xy=8满足x.x.y-x.y.y-x+y=56.求x.x+y.y的值
已知x,y为自然数,x>y且满足(x+y)+(x+xy-y)+x/y=243求x+y的值
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知x+y=-5,x*x+y*y=19求xy和(x-y)*(x-y)的值
已知XY.Y=-3,求-XY(X.X.X.Y.Y.Y.Y.Y.Y.Y-3.X.X.Y.Y.Y.Y.Y-Y)的值.(过程完
已知实数x y满足x×x+y×y-xy+2x-y+1=0 试求x y的值
正整数x,y满足x2-y2=2xy,求x-y/x+y的值
整数x,y满足x2-y2=2xy,求x-y/x+y的值
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x+y=-5,x*x*x+y*y=19,求xy和(x-y)的值
已知x,y满足x^2+y^2-6x+8y+25=0,求y^x的值