а)f'(x)=12-3x^2 3x^2=12 x^2=4 x1=2 x2=-2
f''(x)=-6x f''(2)=-12<0 f(2)=21-max</p>
f''(-2)=12>0 f(-2)=-27-min
b)f'(x)=6x^2+6x 6x(x+1)=0 x1=0 x2=-1
f''(x)=12x+6 f''(0)=6>0 f(0)=-4-min
f''(-1)=-6<0 f(-1)=-3-max</p>
c)f'(x)=-4x^3 4x^3=0 x=0
f'(-1)=4>0 f'(1)=-4<0 f(0)=17-max</p>
d)f'(x)=2x^3-2x 2x(x+1)(x-1)=0 x1=0 x2=-1 x3=1
f''(x)=6x-2 f''(0)=-2 <0 f(0)=0-max</p>
f''(-1)=-8<0 f(-1)=-1/2</p>
f''(1)=4>0 f(1)=-1/2-min