函数fx在x0处对任意
显然f(0)=1,且f(x)在x=0处连续(x-->x0)limf(x0)=lim[f(x0)*f(0)]=lim[f(x0)*f(x-x0)]=limf(x0+x-x0)=limf(x)
所以,f(x)在任意一点x0,都连续.
即,f(x)在R上连续 .
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