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垂直平分線為:L k(P1P2)=(5+7)/(-3-5)=-3/2 k(L)=2/3 P1P2的中點M,則 xM=(-3+5)/2=1,yM=(5-7)/2=-1 L:y+1=(2/3)*(x-1) 線段P1P2的垂直平分線的方程:2x-3y-5=0
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