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已知函数f(x)=x2+2x+1,若存在实数t,当x∈[1,m]时,f(x+t)...
已知函数f(x)=x2+2x+1,若存在实数t,当x∈[1,m]时,f(x+t)≤x恒成立,则实数m的最大值是( )
A.1
B.2
C.3
D.4
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