y=2^xå¨x=1ç导æ°ã
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¬å¼ï¼y=a^x,y'=a^xlna.
y=2^xæ¯y=a^xå¨a=2æ¶åçç¹æ®æ
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y'=2^xln2.
x=1,y'=2^1ln2=2ln2ã
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f'/x=x0=limh-0[f(x0+h)-f(x0ï¼]/h
f(x)=2^x.ç¶åx0=1
f'/x=1=limh-0[f(1+h)-f(1)]/h
=limh-0[2^(1+h)-2^1]/h
=limh-0(2x2^h-2)/h
=limh-0[2(2^h-1)]/h
=2limh-0(2^h-1)/h
h-0,2^h-1=2^0-1=1-1=0
h-0,h-0
å代æ°å¼ä¸º0/0åã
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(2^hln2-0)/1
=2^hln2
=2^0ln2=1xln2=ln2
åf'/x=1çå¼=2ln2ã
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