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第18讲导数与函数的极值、最值1.B[解析]f'(x)=1x-1=1-xx,令f'(x)=0,得x=1,当x∈(0,1)时,f'(x)>0,当x∈(1,e]时,f'(x)<0,所以f(x)在区间(0,e]... 2026-07-1948844.8 KB7页103
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