giúp mình bài này ........... ....

K

kissme94

bai 10sgk

a) f(10)=18\Rightarrow so dan nam 1980=18000 nguoi
b) f'=120/(t+5)^2
f'>0 \forallt thuoc [0;+\infty) \Rightarrowham so dong bien tren [0;+\infty)
c)f'(20)=0,192
f'=0,125\Leftrightarrow t=26\Rightarrownam 1996
 
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