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【单选题】
给出如下三个等式：①f(a+b)=f(a)+f(b)；②f(ab)=f(a)+f(b)；③f(ab)=f(a)×f(b)，则下列函数中，不满足其中任何一个等式的函数是 [ ]A.
f(x)=x 2
B.
f(x)=3x
C.
y=2 x
D.
f(x)=lnx
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