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5個 平行於ABC的有2個 等邊三角形的高是2倍根號3,所以另3個平面分別過三邊中點連線且垂直於三角形ABC. 總結:此類題目,如果是等邊三角形,距離d大於高的一半,這樣的面有2個; 距離等於高的一半,這樣的面有5個(如題); 距離小於高的一半,這樣的面有8個.
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