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如果l與AB點距離相等,則l必定過AB中點 設AB中點為C,則C(4,2.5) 再求l1、l2交點D 求得D(1,2) 設l為y=ax+b 帶入CD兩個點,得a=1/6,b=11/6 所以l的方程是x-6y+11=0
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