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題目等價於當x∈(-∞,1]時1+2^x+4^xa>0恒成立 a>-[2^(-x)]^2-2^(-x)=-[2^(-x)+1/2]^2+1/4 x∈(-∞,1],2^(-x)∈[1/2,+∞) 所以右邊最大值為-1+1/4=-3/4 a>-3/4
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