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(X-2)(X+3)=0 →X=-3(舍)X=2 2. g(X)=1-aX*2+(2a-1)X 對稱軸:2a-1/2a=1-1/2a按對稱軸分類:1.小於等於-2 2.在(-2,3) 3.大於等於3分類時 還要注意 二次函數的開口方向
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