y=<span>√x-2x^2+3y'=1/(2<span>√x) -4x</span>1/(2<span>√x)-4x=0(1-8x<span>√x)/(2<span>√x)=0</span></span>(1-8<span>√x^3)/2<span>√x=0</span></span>1-8<span>√x^3=0 <span>√x=0<span>√x^3=1/8</span></span></span> x=0<span>√x=1/2</span>x=1/4 + ------(0)----(1/4)-----> maxОтвет: x=1/4 </span></span>