<span>f(x)=-2/3 *x^3+x^2+12</span>
<span><span> f '(x)=-2х^2+2х</span></span>
<span><span>-2х^2+2х=о</span></span>
<span><span>2х(-х+1)=0</span></span>
<span><span>х=0 ,х=1</span></span>
<span><span></span></span>
...................................................
a= b+2b
a=3b
Потому что 200 - 2