解方程 x2-4xy+4y2-2x+4y=3

x2-2xy+y2=4 x2+y2-x-y=6 解不等式x2-2xy+y2=4 x2+y2-x-y=6 解不等式 4x2-y2/x2-2xy+y2 +(2x-y)/2x2-2xy 解方程 x2-4xy+4y2-2x+4y=3 计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2） x2-4y2-3xy+y+x 解方程组 ｛3x2-y2=8 {4x2+12xy+9y2=1 {x2+2xy+y2-4=0 x2+xy+y2=4 4x2-9y2=0 x2-2xy+y2-1=0还有{x2+y2=4xy-y2+4=0x2-----x的平方 y2------y的平方 还有{2x-3y=12x2-3xy+y2-4x+3y-3=0 已知x2+4y2+x2y2+1=6xy,则(x4-y4)/(2x2+xy-y2)*(2x-y)/(xy-y2)/(x2+y2/y)2= 因式分解x2-4xy+4y2+x-2y-2 x2-4xy+4y2-x+2y-2因式分解 (-x-2y)(x2-2xy+4y2)等于多少 2x2+xy-y2-4x+5y-6 因式分解 2x2+xy-3y2+x+4y-1因式分解 已知x/y+y/x=2,求(x2+xy+y2)/(x2-4xy+y2)的值 已知x2+y2+4x-2y+5=0,求x2+2xy+y2值 一道解方程,x2-4xy+4y2=1,1/（2x-y）=1 若x-y/x+y=2,则x2+2xy+y2/4xy=多少 (x2+xy+y2)-4xy(x2+y2) X2+Y2+8X+6Y+25=0 求代数式(x2-4y2/x2+4xy+4y2)-x/x+2y