解由f(x)=log2(2^x-1),若f(x)>1
則log2(2^x-1)>1
即log2(2^x-1)>log2(4)
即2^x-1>4
即2^x>5
即x>log2(5).1應(yīng)該log2(2),怎么會(huì)等于log2(4)的?你好拿錯(cuò)了一點(diǎn)由f(x)=log2(2^x-1),若f(x)>1則log2(2^x-1)>1即log2(2^x-1)>log2(2)即2^x-1>2即2^x>3即x>log2(3)。
函數(shù)f(x)=log2(2^x-1),若f(x)>1,求x的取值范圍
函數(shù)f(x)=log2(2^x-1),若f(x)>1,求x的取值范圍
數(shù)學(xué)人氣:892 ℃時(shí)間:2020-05-22 09:57:01
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