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定義域X>0 f'(x)=1/x+2x+a ∵x>0,∴1/x+2x≥2(1/x·2x)^1/2=2,∴-(1/x+2x)≤2·根號二 f(x)在定義域內為增函數 f'(x)≥0,(x>0)恒成立 ∴a+1/x+2x≥0 a≥-(1/x+2x) a≥-2乘根號二
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