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(2002•南昌)计算(-1)(+1)2的结果是( ) A.+1 B.3(-1)...
(2002•南昌)计算(
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-1)(
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+1)
2的结果是( )
A.
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+1
B.3(
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-1)
C.1
D.-1
考点分析:
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