问题
选择题
已知函数f(x)满足:当x≥1时,f(x)=f(x-1);当x<1时,f(x)=2x,则f(log215)=( )
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答案
当输入x=log215时,
因为log215≥1,
所以f(log215)
=f(log215-1)
=f(log215-1-1)
=f(log215-1-1-1)
=f(log215-4)
=f(log2
)15 16
=2log 2
=15 16
.15 16
故选A.