y=log以2为底(x²+4)的对数的值域?
y=log以2为底(x²+4)的对数的值域?
数学人气:333 ℃时间:2019-10-01 08:17:33
优质解答
t=x²+4≥4
因为 y=log2 (t)为增函数
所以 log2(t)≥log2(4)=2
所以,值域为【2,+∞)
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