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是2/x還是x/2,還是(y-2)/(x-2)? 總之,先在平面直角坐標系內作出不等式組所表示的區域,是一個三角形 如果是(y-2)/(x-2)的話,那求的就是點(2,2)與區域內任意一點所確定的直線的斜率範圍 算出來貌似是(-7/4,+無窮)
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