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(2008•庐阳区)若a为任意实数,则下列等式中恒成立的是( ) A.a+a=a...
(2008•庐阳区)若a为任意实数,则下列等式中恒成立的是( )
A.a+a=a2
B.a•a=2a
C.a÷a=1
D.a-a=0
考点分析:
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