给出下列三个等式:f(xy)=f(x)+f(y),f(x+y)=f(x)f(y)给出下列三个等式:f(xy)=f(x)+f(y),f(x+y)=f(x)f(y),f(x+y)=f(x)+f(y)/1-f(x)f(y),下列函数中不满足其中任何一个等式的是()A.f(x)=3^xB.f(x)=sinxC.f(x)=log2xD.f(x)=tanx要解析
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![给出下列三个等式:f(xy)=f(x)+f(y),f(x+y)=f(x)f(y)给出下列三个等式:f(xy)=f(x)+f(y),f(x+y)=f(x)f(y),f(x+y)=f(x)+f(y)/1-f(x)f(y),下列函数中不满足其中任何一个等式的是()A.f(x)=3^xB.f(x)=sinxC.f(x)=log2xD.f(x)=tanx要解析](/uploads/image/z/10211406-6-6.jpg?t=%E7%BB%99%E5%87%BA%E4%B8%8B%E5%88%97%E4%B8%89%E4%B8%AA%E7%AD%89%E5%BC%8F%3Af%28xy%29%3Df%28x%29%2Bf%28y%29%2Cf%28x%2By%29%3Df%28x%29f%28y%29%E7%BB%99%E5%87%BA%E4%B8%8B%E5%88%97%E4%B8%89%E4%B8%AA%E7%AD%89%E5%BC%8F%3Af%28xy%29%3Df%28x%29%2Bf%28y%29%2Cf%28x%2By%29%3Df%28x%29f%28y%29%2Cf%28x%2By%29%3Df%28x%29%2Bf%28y%29%2F1-f%28x%29f%28y%29%2C%E4%B8%8B%E5%88%97%E5%87%BD%E6%95%B0%E4%B8%AD%E4%B8%8D%E6%BB%A1%E8%B6%B3%E5%85%B6%E4%B8%AD%E4%BB%BB%E4%BD%95%E4%B8%80%E4%B8%AA%E7%AD%89%E5%BC%8F%E7%9A%84%E6%98%AF%28%29A.f%28x%29%3D3%5ExB.f%28x%29%3DsinxC.f%28x%29%3Dlog2xD.f%28x%29%3Dtanx%E8%A6%81%E8%A7%A3%E6%9E%90)
给出下列三个等式:f(xy)=f(x)+f(y),f(x+y)=f(x)f(y)给出下列三个等式:f(xy)=f(x)+f(y),f(x+y)=f(x)f(y),f(x+y)=f(x)+f(y)/1-f(x)f(y),下列函数中不满足其中任何一个等式的是()A.f(x)=3^xB.f(x)=sinxC.f(x)=log2xD.f(x)=tanx要解析
给出下列三个等式:f(xy)=f(x)+f(y),f(x+y)=f(x)f(y)
给出下列三个等式:
f(xy)=f(x)+f(y),
f(x+y)=f(x)f(y),
f(x+y)=f(x)+f(y)/1-f(x)f(y),
下列函数中不满足其中任何一个等式的是()
A.f(x)=3^x
B.f(x)=sinx
C.f(x)=log2x
D.f(x)=tanx
要解析
给出下列三个等式:f(xy)=f(x)+f(y),f(x+y)=f(x)f(y)给出下列三个等式:f(xy)=f(x)+f(y),f(x+y)=f(x)f(y),f(x+y)=f(x)+f(y)/1-f(x)f(y),下列函数中不满足其中任何一个等式的是()A.f(x)=3^xB.f(x)=sinxC.f(x)=log2xD.f(x)=tanx要解析
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