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定義域為R, 那必須mx^2+4x+m+2恒大於等於0 x^2-mx+1不能等於0 也就是 對於mx^2+4x+m+2開口向上,判斷式△小於等於0,即 m>0① △=16-4m(m+2)≤0② 對於x^2-mx+1,△
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