Решите три примера ......................
3. y'=-1+361/x^2
y''=(-2)*361*x^(-3)
y(19)<0 max</p>
у(-19)>0 min
y(-19)=19-361/(-19)=38
2.
x=8*0,81/0,18=36
1.
c(f-f0)/(f+f0)<=20</p>
f<=f0(c+20)/(c-20)</p>
f=481*1520/1480=494