两圆x^2+y^2=2与x^2+y^2-2x-4y=0的公共弦所在的直线方程

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 两圆X^2+Y^2-4X+2Y+1=0与X^2+Y^2+4X-4Y-1=0的公切线有几条 两圆x^2+y^2-6x+16y=0与x^2+y^2+4x-8y-44=0的公切线条数 两平行直线x+y+2=0与x+y-3=0的距离 2xy/(x+y)(x+y)与x/(x+y)(x-y)怎么通分 两直线2x+y-a=0与x-2y+b=0圆的位置关系是什么? 化简y(x+y)+(x+y)(x-y)-x^2 两圆x^2+y^2=2与x^2+y^2-2x-4y=0的公共弦所在的直线方程 2x-y=0与x+y=10 已知Y=2X,X与Y不成比例. 2x=Y Y与X成?比例 比较(x^2+y^2)(x-y)与(x^2-y^2)(x+y)的大小 化简(x^2-y^2)/(x+y)解法一：(x^2-y^2)/(x+y)=(x+y)(x-y)/(x+y)=x-y解法二：(x^2-y^2)/(x+y)=(x^2-y^2)(x-y)/(x+y)(x-y)=(x^2-y^2)(x-y)/(x^2-y^2)=x-y你认为小红同学的两种解法对吗?若解法错误,请说明原因 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 2xy/(x+y)^与x/x^-y^ 两圆x*x+y*y+2kx+k*k-1=0与x*x+y*y+2(k+1)y+k*k+2k=0的圆心之间最短距离是多少? 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 因式分解x(x+y)(x-y)-x(x+y)^2