已知x+y=2,x-y=12,则分式2x2-2y2x2+2xy+y2的值是 ___ .
已知x+y=2,x-y=12,则分式2x2-2y2x2+2xy+y2的值是 ___ .
化简(x-yx2-2xy+y2-xy+y2x2-y2)•xyy-1= ___ .
已知:x=3,y=-5,x2-2xy+y2/x2-y2的值是
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知实数x,y满足x2+4xy+4y2-x-2y+14=0,则x+2y的值为 ___ .
已知x+y=8,xy=12,求x2+y2;(x-y)2的值
已知x、y是实数且满足x2+xy+y2-2=0,设M=x2-xy+y2,则M的取值范围是______.
已知x2+y2-2x-4y+5=0,分式yx−xy
已知x+y=4,xy=2,求x2+y2+3xy的值.
已知x(x-1)+(y-x2)=6,则代数式x2+y2/2-xy的值是
已知x2+y2=20,x2+xy-2y2=2(x+2y),求x+y的值
已知x-y+1,X2+Y2=25 求(x+y)2和x2-xy+y2的值