[tex]y=(x-9)e^{10-x} [/tex] 

|-11;11|

y`=e^10-x-(x-9)e^10-x=e^10-x *(1-x+9)=e^10-x*(10-x)=010-x=0x=10∈[-11;11]y(-11)=-20*e^21-наимy(10)=e^0=1u(11)=2*e^-1=2/e-наиб