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2个回答
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(1)
f(x+y)=f(x)f(y)
x=0=0
f(0) = f(0).f(0)
f(0) . ( 1- f(0) ) = 0
f(0) =1
(2)
f'(x)
=lim(h->0) [f(x+h)-f(x) ]/h
=lim(h->0) [f(x).f(h)-f(x) ]/h
=f(x) . lim(h->0) [f(h)-1]/h
=f(x) . f'(0)
=f(x)
f(x+y)=f(x)f(y)
x=0=0
f(0) = f(0).f(0)
f(0) . ( 1- f(0) ) = 0
f(0) =1
(2)
f'(x)
=lim(h->0) [f(x+h)-f(x) ]/h
=lim(h->0) [f(x).f(h)-f(x) ]/h
=f(x) . lim(h->0) [f(h)-1]/h
=f(x) . f'(0)
=f(x)
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