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函数f(x)=x|x+a|+b是奇函数的充要条件是( ) A.a•b=0 B.a...
函数f(x)=x|x+a|+b是奇函数的充要条件是( )
A.a•b=0
B.a+b=0
C.a2+b2=0
D.a=b
考点分析:
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