-2n-(3n-1)化简
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-2n-(3n-1)化简-2n-(3n-1)化简-2n-(3n-1)化简=-2n-3n+1=-5n+1设M点的坐标为（x,y)|MA|=|MB|[(-3-x)^2+(2-y)^2]^(1/2)=[(3
-2n-(3n-1)化简
-2n-(3n-1)化简
-2n-(3n-1)化简
=-2n-3n+1
=-5n+1
设M点的坐标为（x,y)
|MA|=|MB|
[(-3-x)^2+(2-y)^2]^(1/2)=[(3-x)^2+(-2-y)^2]^(1/2)
[(-3-x)^2+(2-y)^2]=[(3-x)^2+(-2-y)^2]
9+6x+x^2+4-4y+y^2=9-6x+x^2+4+4y+y^2
12x-8y=0
3x-2y=0
即证。
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