若(x-2y)^2=x^2+2xy+4y^2+M,则M=?

若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 若x^2+xy+y=14,y^2+xy+x=28,求x+y 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y （-3x^y+2xy)-( )=4x^+xy (x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1) 若x+y=4,x^3+y^3=(x+y)(x^2-xy+y^2)z,求x^3+12xy+y^3的值. 计算：[(x-y)^2-(x+y)^2]/(-4xy)= 若|x-3|+（y+2）=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 若|x-3|+（y+2）²=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 2x^+xy-y^-4x+5y-6=? 若x+y=4,x-y=6,求xy(y^2+y)-y^2(xy+2x)-3xy的值. 若x+y=4 x-y=6 求xy(x^2+y)-y^2(xy+2x)-3xy的值求值 计算:2xy/(x+y)².(x+y)/4y 若x-y/x+y=2,则x2+2xy+y2/4xy=多少