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關於x軸堆成移動時,二次函數為:對稱軸不變為x=-b/2a=2,因為開口朝下,所以x^2前面係數為-1,則b=4,因為頂點座標變為(2,-1),根據y軸距離為(4ac-b^2)/4a=-1,則c=-5,則二次函數為:y=-x^2+ 4x-5.以此類推,關於y軸對稱…
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