f(x)=(log2 x/2)(log2 x/4) (根号2 ≤ x ≤ 8) 求值域..
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f(x)=(log2 x/2)(log2 x/4) (根号2 ≤ x ≤ 8) 求值域..
f(x)=(log2 x/2)(log2 x/4) (根号2 ≤ x ≤ 8) 求值域..
f(x)=(log2 x/2)(log2 x/4) (根号2 ≤ x ≤ 8) 求值域..
将对数化成除式的形式,即:(log2x)/(log2 2) (log2x)/(log2 4)化简等于2倍(log2x)的平方!根据x的条件知,当x为根号2时最小为1,当为8时值最大为6.明白?
已知函数f(x)=log2^ ( x/4 ) ×log2^ (2x) (1)解不等式f(x)>0;(2)当x∈【1,4】时,求f(x)的值域f(x)=log2(2x)×log2(x/4)=[(log2 2)+(log2 x)] ×[(log2 x) -(log2 4)]=[1+(log2 x)] ×[(log2 x) -2]=(log2 x)² - (log2 x) -2
设f(log2 X)=2^x,则f(2log2 3)=
f(x)=log2(x/8)*log2(2/x)
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log2^(x^log2^x)=?
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