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已知平行四邊形ABCD頂點為A(2,1)、B(8,2)、C(12,9)、D(6,8),圓C:(x-1)2+(y+2)2=9,一直線L恰可同時平分平行四邊形ABCD與圓C的面積,試求此L直線方程式為?
﹝出自101學年度指考模擬試題﹞