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单选题
If (c+1)2＝-b, which of the following statement could be true?I. c>0II. c＝0III. c<0
A
None
B
I only
C
III only
D
I and II only
E
I, II, and III
参考答案
参考解析
解析：
假设c=5，那么b＝-36。假设c＝0, b＝-1。假设c＝-5, b＝-16。所以I. II. III都有可能。
假设c=5，那么b＝-36。假设c＝0, b＝-1。假设c＝-5, b＝-16。所以I. II. III都有可能。
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