已知2x-y=10求[x2+y2-(x-y)2+2y(x-y)]÷4y
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,
已知2x=y,求代数式[(x2+y2)-(x-y)2+2y(x-y)]÷(4y)的值.
已知x2-2x+y2+6y+10=0,求(2x-y)的值
已知 x2 +y2 -2x+4y =0 ,求 x-2y 最大值
已知x2+y2-2x+4y+5=0,求(x^4-y^4)/(2x^2+xy-y^2)·[(2x-y)/(xy-y^2)]
已知:x2+2x+y2-6y+10=0,求x,y的值.
已知:x2+y2-10x-2y+26=0,求x、y的值.
已知x2+y2+2x-6y+10=0,求x+y的值.
已知x2+4x+y2-2y+5=0,求x,y的值.
已知x2+y2-6x+4y+13=0,求2x+3y
已知实数x、y满足x2+4y2=2x+4y-2,求x-2y的平方根.
已知:x2+4x+y2-6y+13=0,求(x-2y)/(x²+y²)