圆x^2+y^2+2x-4y-13=0 与直线x-y+k=0的距离怎么计算
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
已知x^2+y^2+13-4x+6y=0,求(2x-y)^2-2(2x-y)(x+2y)+(x+2y)^2
x*x+2x+y*y-4y+5=0 x= y=
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)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+4x+y*y-2y+5=0,则x*x+y*y=?
化简求值:已知x、y满足:x^2+y^2-4x+6y+13=0 求代数式 的值.(3x+y)^2-3(3x-y)(x+y)-(x-3y)(x+3y)急用!
x^2+y^2+6x-4y+13=0求x,y,x^2-y^2的值
如果有理数x.y满足x^2+y^2+4x-6y+13=0,则y^x=?
X×X-2XY-Y×Y+2X-2Y+2=02X×2X-4XY-2Y×2Y+3X-3Y+4=0X×X+2XY+Y×Y+X+Y-56=0X×X-2XY+Y×Y-X+Y-12=0X×X-3XY+Y×Y=-13X×3X-XY+3Y×3Y=13 两个在一起的方程之间有所联系(要求一步一步写出来)
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
已知:x^2+y^2+4x-6y+13=0,求x^y值.
x^2+y^2+4x-6y+13=0,求x^y的值
x^2+y^2-4x+6y+13=0,x,y的值
x^2-4x+y^2-6y+13=0求x,y的值
若x^2+y^2-6x+4y+13=0 求x+y
因式分解 若 x^2+4x+y^2-6y+13=0 求y^x
x平方-4x+2y+6y+13=0则x= y=?