给出下列三个等式:f(xy)=f(x)+f(y),f(x+y)=f(x)f(y)

f(xy)=f(x)+f(y).f(x)=3^x
B,
下列函数中不满足其中任何一个等式的是()
A,
f(x+y)=f(x)f(y),
f(x+y)=f(x)+f(y)/1-f(x)f(y)给出下列三个等式

f(x)=3^x f(y)=3^y
f(x)f(y)=3^x*3^y=3^(x+y)=f(x+y)

f(x)=log2x f(y)=log2y
f(xy)=log2xy=log2x+ log2y= f(x)+f(y),

f(x)=tanx f(y)=tany
f(x+y)=tan(x+y)=[tanx+tany ]/(1-tanxtany )
=f(x)+f(y)/1-f(x)f(y),
只有 B.f(x)=sinx 不满足
所以选B

f(x)=3^x f(y)=3^y f(x)f(y)=3^x*3^y=3^(x+y)=f(x+y) f(x)=log2x f(y)=log2y f(xy)=log2xy=log2x+ log2y= f(x)+f(y), f(x)=tanx f(y)=tany f(x+y)=tan(x+y)=[tanx+tany ]/(1-tanxtany ) =f(x)+f(y)/1-f(x)f(y),

如以上回答内容为低俗、色情、不良、暴力、侵权、涉及违法等信息，可以点下面链接进行举报！

点此我要举报以上问答信息