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已知函数,若存在实数,当时恒成立,则实数的最大值为 A.
已知函数,若存在实数,当时恒成立,则实数的最大值为 A.
已知函数
,若存在实数
,当
时
恒成立,则实数
的最大值为
A
.
B
.
C
.
D
.
答案
C
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