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Á½±ßÈ¡¶ÔÊý:
y = k1*exp(k2*x)
ln(y) = ln(k1) +k2*x
Áîy'=ln(y) ,b=ln(k1)±ê×¼µÄÏßÐÔÄâºÏ£¬
y=k2*x+b
~~~
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