圆x^2+y^2+8x-6y+21=0与直线y=mx交于P,Q两点,O为坐标原点(1)求OP,OQ(2)求弦PQ中点M的坐标所满足的方程
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圆x^2+y^2-8x+6y=0与x^2+y^2+4x-6y-12=0关于直线-----对称
两圆x^2+y^2-6x+16y=0与x^2+y^2+4x-8y-44=0的公切线条数
x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值
已知X*X+Y*Y+6X-8Y+25=0 求(Y/X)+(X/Y)-2=?
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
设实数x,y满足方程:x^2+y^2-8x-6y+21=0 (1)求S=2x-y的最大值与最小值(2)求T=x^2+y^2-10x+2y+26的(2)求T=x^2+y^2-10x+2y+26的最大值与最小值.
已知圆x^2+y^2+x-6y+m=0与直线x+2y-3
2X-5Y+13=0 9X+6Y-8=0 求X与Y的值
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
X^2-Y^2+6X+10Y-30=0 X^2+Y^2-5X-8Y+21=0 X=?Y=?
圆C1:X*X+Y*Y+2Y-6Y-26=0与圆C2:X*X+Y*Y-4X+2y+4=0的公切线有多少条
圆x^2+y^2-4x+2y+4=0与圆x^2+y^2+2x-6y-26=0的位置关系
圆x^2+y^2+4x-6y+4=0与圆x^2+y^2+2x-4y-4=0的交点坐标
判定圆x^2+y^2-6x+4y+12=0与圆x^2+y^2-14x-12y+14=0是否相切?
判断圆X²+Y²-6X+4Y+12=0与圆X²+Y²-14X-2Y+14=0是否相切
2x-y=0与x+y=10
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
与圆x^2+y^2-4x=0外切,又与y轴相切的圆的圆心轨迹方程是A.y^2=8x B.y^2=8x(x>0)和y=0 C.y^2=8x(x>0) D.y^2=8x(x>0)和y=0(x