已知x2+y2-2x-4y+5=0,则1xy+1(x+1)(y+1)+1(x+2)(y+2)+…+1(x+2010)(y
已知x2+y2-2x-4y+5=0,则1xy+1(x+1)(y+1)+1(x+2)(y+2)+…+1(x+2010)(y
已知实数x,y满足(x2)+(y2)-xy+2x-y+1=0,求x,y的值
已知实数x、y满足X2+y2-xy+2x-y+1=0,试求x、y的值
已知x2+4y2+x2y2-6xy+1=0,求 x4-y4/2x-y 乘 2xy-y2/xy-y2 除以(x2+y2/x
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,
若x2-2xy-y2-x+Y-1=0 求x-y的值
(x+y)(x+y+1)=0 求x2+y2+2xy的值
已知x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
2x2+xy-3y2+x+4y-1因式分解
已知实数x,y满足x2+y2-xy+x-1/2y+1/4=0 试求x,y的值
已知x+y=5,xy=4,求:(1)(x+y)2;(2)x2+y2;(3)x-y的值.