|x-2y+1|+(x+y-5)²=0,则5x+4y=
x²-2x+y²+4y+5=0,求x²+2y的值
已知实数x、y满足5x²-3xy+1/2y²-2x+1/2y+1/4=0 求x、y的值
已知x²+y²-4x-2y+5=0,则根号x+y除以根号x-y的值是多少?
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y
已知5x²+4x-2xy+y²+1=0,求x,y的值
(x-1)²+4|y-6|=0则5x+6y-4x-8y=
若(3X+2Y-1)²+绝对值【3Y-2X-5】=0则X+Y=( )
1.已知x/x-1=(y²+4y-1)/(y²+4y-2),则y²+4y-x的值为多少?
|3x-y+5|+(2x-y+3)²=0 求x=?y=?
已知x/3y=y/2x-5y=6x-5y/x,则4x²-5xy+6y²/x²-2xy+3y