挑战习题
1/3单选题
难度：

1.已知则的最小值为（    ）
A 1
B 2
C 3
D 4
提示1：
PGltZyB3aWR0aD0xODkgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNkIvNDgvckJBQ0UxUzAwbVNodkpSU0FBQUM5VEVMQmdRMzIwLnBuZyI+
正确答案：Qw==
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

提示0/1

A

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