f(x)=log2(x/2)*log2(√ x/2)=1/2[log2(x/2)]^2=1/2[log2(x)-1]^2=1/2[log2(x)]^2-log2(x)+1/2
f(x)=log2(x/2)乘log根号2(根号x/2)怎么化简
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