看不懂叫我啊!求函数y=(log2(x/2))(log2(x/4))的值域,其中x满足-3≤log1/2(x)≤-1/2

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看不懂叫我啊!求函数y=(log2(x/2))(log2(x/4))的值域,其中x满足-3≤log1/2(x)≤-1/2

看不懂叫我啊!求函数y=(log2(x/2))(log2(x/4))的值域,其中x满足-3≤log1/2(x)≤-1/2
看不懂叫我啊!求函数y=(log2(x/2))(log2(x/4))的值域,其中x满足-3≤log1/2(x)≤-1/2

看不懂叫我啊!求函数y=(log2(x/2))(log2(x/4))的值域,其中x满足-3≤log1/2(x)≤-1/2
令t=log2(x/2) 换元得 y=t(t-1) -1/2 ≤ t≤2
最小值-1/4最大值2