x2+y2-2x+1=0.求x的y次方的值
已知实数x.y满足(x2+y2)(x2+y2-1)=2,求x2+y2的值
已知x2次方+y2次方—2x +1=0,求xy次方的值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知x-y+1,X2+Y2=25 求(x+y)2和x2-xy+y2的值
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,
x(x-1)-(x2-y)=-3,求x2-y2-2xy的值
x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
已知x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
2010.09.已知x、y为实数,且(x2+y2)(x2+y2+1)=20,求x2+y2的值
已知x,y为实数,且(x2 +y2)(x2 +y2+2)=3.求x2 +y2的值
需过程已知x=2√3+1 求代数x2次方y+xy2次方的值 ,已知x=2-√3,y=2+√3,求代数式x2次方+y2次方
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值