当x属于(0,1/2)时,不等式4^x-log(a,x
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当x属于(0,1/2)时,不等式4^x-log(a,x
当x属于(0,1/2)时,不等式4^x-log(a,x
当x属于(0,1/2)时,不等式4^x-log(a,x
当x∈(0,1/2)时,只要4^x
0
而又有0
故有a^2>=1/2
a>=根号2/2
综上所述,范围是根号2/2<=a<1.