f(x)=(ln x^3)/x and if f(1)=0, then f(9)=?
回答 (2)
f(x)=(ln x^3)/x and if f(1)=0,then f(9)=?
Sol
f(1)=(ln1^3)/1=0^3/1=0
f(9)=(ln9^3)/9=3ln9/9=6ln3/9=2ln3/3
收錄日期: 2021-04-30 22:43:38
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