求下列动圆圆心的轨迹方程1.与圆C:(X+2)^2+Y^2=2内切,且过点A(2,0).2.与圆C1:x^2+(y-1)^2=1 和圆C2:x^2+(y+i)^2=4都外切3.与圆C1:(x+3)^2+y^2=9外切,且与C2:(x-3)^2+y^2=1内切别随便复制别人的,那个人写
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求下列动圆圆心的轨迹方程1.与圆C:(X+2)^2+Y^2=2内切,且过点A(2,0).2.与圆C1:x^2+(y-1)^2=1 和圆C2:x^2+(y+i)^2=4都外切3.与圆C1:(x+3)^2+y^2=9外切,且与C2:(x-3)^2+y^2=1内切别随便复制别人的,那个人写
求下列动圆圆心的轨迹方程
1.与圆C:(X+2)^2+Y^2=2内切,且过点A(2,0).
2.与圆C1:x^2+(y-1)^2=1 和圆C2:x^2+(y+i)^2=4都外切
3.与圆C1:(x+3)^2+y^2=9外切,且与C2:(x-3)^2+y^2=1内切
别随便复制别人的,那个人写的我看不懂~\(≧▽≦)/~
求下列动圆圆心的轨迹方程1.与圆C:(X+2)^2+Y^2=2内切,且过点A(2,0).2.与圆C1:x^2+(y-1)^2=1 和圆C2:x^2+(y+i)^2=4都外切3.与圆C1:(x+3)^2+y^2=9外切,且与C2:(x-3)^2+y^2=1内切别随便复制别人的,那个人写
1.与圆C:(X+2)^2+Y^2=2内切,且过点A(2,0).
rC=√2
动圆圆心B(x,y)
rB=AB=rC+BC
√[(x-2)^2+y^2]=√2+√[(x+2)^2+y^2]
圆心的轨迹方程:
(x-1.5)^2/5.75-y^2/11.5=1
2. 与圆C1:x^2+(y-1)^2=1 和圆C2:x^2+(y+i)^2=4都外切
C1(0,1),rC1=1
C2(0,-1),rC2=2
动圆圆心D(x,y)
DC1=rD+rC1,DC2=rD+rC2
√[(x^2+(y-1)^2]=rD+1.(1)
√[x^2+(y+1)^2]=rD+2.(2)
(2)-(1):
√[x^2+(y+1)^2]-√[x^2+(y-1)^2]=1
y^2/0.25-x^2/0.75=1
3. 与圆C1:(x+3)^2+y^2=9外切,且与C2:(x-3)^2+y^2=1内切
C1(-3,0),rC1=3
C2(3,0),rC2=1
动圆圆心的轨迹方程:x=2,y=0