对所有实数x、y,若函数y=f(x)满足f(xy)=f(x)f(y),且f(0)≠0,则f(2009)=( )A.2008B.2009C.1D.2
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对所有实数x、y,若函数y=f(x)满足f(xy)=f(x)f(y),且f(0)≠0,则f(2009)=( ) |
答案
因为f(xy)=f(x)f(y), 故f(0)=f(0)f(0); 又∵f(0)≠0, ∴f(0)=1, ∴f(0)=f(2009×0)=f(2009)f(0)=f(2009)=1, 故本题选C. |
举一反三
函数y=-中的自变量x的取值范围是( )A.x≥0 | B.x<0且x≠1 | C.x<0 | D.x≥0且x≠1 |
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函数y=中自变量x的取值范围是( )A.x≤且x≠0 | B.x>-且x≠0 | C.x≠0 | D.x<且x≠0 |
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