A(5,1),B(b,2b-1),C(2c+5,c)
(xA+xC)/2=(5+2c+5)/2=5+c,(yA+yC)/2=(1+c)/2
BM:2x-y-1=0
2*(5+c)-(1+c)/2-1=0
c=-17/3
C( )
k(AB)*k(cH)=-1
B( )
(xB+xC)/2=
(yB+yC)/2=
k(BC)=
BC边的垂直平分线L
k(L)=-1/k(BC)
A(5,1),B(b,2b-1),C(2c+5,c)
(xA+xC)/2=(5+2c+5)/2=5+c,(yA+yC)/2=(1+c)/2
BM:2x-y-1=0
2*(5+c)-(1+c)/2-1=0
c=-17/3
C( )
k(AB)*k(cH)=-1
B( )
(xB+xC)/2=
(yB+yC)/2=
k(BC)=
BC边的垂直平分线L
k(L)=-1/k(BC)