[img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606163704_19516.png" alt="" />b=2， c=1，那么A的值是（）
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591432869805036.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591432874428482.png" />
C.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591432878415950.png" />
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591432883136908.png" />
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正确答案： B 答案分析：无
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