原式=x(x-y)+y(x+y)+2xy(x+y)(x-y)=x2+2xy+y2
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
正数xy满足x2-y2=2xy,求x+y分之x-y的值
已知x2+y2-2x+4y+5=0,求(x^4-y^4)/(2x^2+xy-y^2)·[(2x-y)/(xy-y^2)]
已知x+y=8,xy=12,求x2+y2;(x-y)2的值
若x2-2xy-y2-x+Y-1=0 求x-y的值
已知实数x、y满足2x2-7xy+3y2=0,求x:y
X2+y2+2xy+x-y=0,求x的最大值及y的最小值
您好 X2-y2=2xy,求x-y除以x+y的值.
(x+y)(x+y+1)=0 求x2+y2+2xy的值
已知实数x,y满足(x2)+(y2)-xy+2x-y+1=0,求x,y的值
1.已知正数x,y满足x2-y2=2xy,求(x-y)/(x+y)的值