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单选题
If a-b＝0, which of the following must be equal to a b ?
A
2a
B
2b
C
a2
D
a
E
o
参考答案
参考解析
解析：
因为a-b=0，所以ab=a×a=a2，故选C项。
因为a-b=0，所以ab=a×a=a2，故选C项。
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考题
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考题
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