若x+4y=2求4x^x+6^2y的值.

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 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 1.(x-2y)(x+2y)-(x平方+y)(x平方-y) 2.(2x-y)(y+2x)-(2y+x)(2y-x)3.已知：x+y=6,x平方-y平方=48,求x,y的值4.x平方-2x分之x+2 -- x平方-4x+4分之x-1 已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的值 x^2+4y^2-6x+4y=-10求x,y的值 x^2+y^2+4x-6y+13=0,求x^y的值 x^2-4x+y^2-6y+13=0求x,y的值 x^2+y^2+4x-6y+12=0.求x^y的值 x^2+y^2+13=6x-4y求x^y的值 x^2+y^2+13=6x-4y,求x^y的值 x^2+y^2+13=6x-4y求x^y的值 已知：4x^2+y^2-4x-6y+10=0,求y/x-x/y的值 x^2+y^2+6x-4y+13=0求x,y,x^2-y^2的值 若x^2+y^2+5/4=2x+y,求x^Y+y^x的值? 若x.y满足x^2+4x+y^2-10y+29=0.求x+y的值 若x*x-4y*y=-15,x+2y=3,求x和y的值 若(x-y)乘(x+y)=5,(x+y)^2=4,试求x-y的值 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙