若(x²+y²)^4-8(x²+y²)²+16=0求x²+y
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+4y²-6x+8y+13=0,求x-y/x+y的值.
若(x²+y²)^4-8(x²+y²)²+16=0求x²+y
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
x²+y²-6x+8y+25=0求(x-y)-²
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知x²+y²-2x+4y+5=0,求x+y
x²+4y²-2x+12y+10=0求X,Y值
已知x²+4x+y-2y+5=0求x+2y