f(x)=log3^(√9-2^x)的值域是
人气:174 ℃ 时间:2020-09-25 14:36:34
解答
因为2^x>0-2^x<0
所以9-2^x<9
所以√(9-2^x)<3
所以log3^√(9-2^x)<log3^3=1
即值域是(-∞,1】
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