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要注意分類討論,當直線沒斜率時,NM垂直x軸,則a=1,直線的方程為x=1, 當直線有斜率時,採用兩點式求方程,設直線的方程為(y-2)/(3-2)=(x-1)/(a-1)整理得x-(a-1)y+2a-3=0(a不等於1)這題我做過,
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