x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/25 08:17:08
x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值x
x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值
x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值
x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值
x²+2x-y²+6y-8=0
x²+2x+1-(y²-6y+9)=0
(x+1)²-(y-3)²=0
(x+1)²=(y-3)²
x+1=±(y-3)
x+1=y-3
x-y=-4
x+1=-(y-3)
x+y=2(舍)
∴x-y=-4
﹣4
利用配方法可以将原式转化为X平方+2X+1－Y平方＋6Y-9＝0，又转化为（X+1）的平方减去（Y-3）的平方=0，再利用平方差公式转化为（X+1+Y-3）(X+1-Y+3)=0，整理得：（X+Y-2）(X-Y+4)=0,因为x+y不等于2，所以X-Y+4=0，所以x-y=-4.
x*x+2x-y*y+6y-8=0 （x+1)^2-(y-3)^2=0 (x+1+y-3) (x+1-y+3)=0
即（x+y-2)(x-y+4)=0 x-y+4=0 x-y=-4
(X+1)^2-(Y-3)^2=0
即X+1=Y-3或X+1=3-Y
得X-Y=-4或X+Y=2(舍)
所以X-Y=-4
x^2+2x-y^2+6y-8=0
配方可得（x+1)^2-(y-3)^2=0
（x+1)^2=(y-3)^2
即x+1=y-3或x+1=3-y
得x-y=-4或x+y=2 （舍）
答案即为x-y=-4
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=?
x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
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+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0
已知x^2+y^2-6x-8y+25=0,求分式y/x - x/y的值
已知x^2+y^2-6x-8y+25=0 求y/x-x/y的值
已知x,y满足x^2+y^2-6x+8y+25=0,求y^x的值
若x^2+y^2-6x+8y+25=0 则y/x-x/y的值是
已知X^2+Y^2-6X-8Y+25=0,求Y/X-X/Y
已x²+2x-y²+6y-8=0,且x+y≠2,求x-y
已知x^2+y^2-6x-8y+25=0,求x分之y-y分之x
已知x平方+y平方+6x-8y+25=0,求y/x+x/y-2的值.
已知|5x-y-8|+(7y-x+2)=0则4x+6y
[2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值