容易的微分解题

1.y=6-x带入,(x^2)y=x^2(6-x)=6x^2-x^3d/dx=-3x^2+12x=-3x(x-4)d2/dx2=-6x+12当d/dx=0时,x为最小值或最大值,x=0,4x=0,d2/dx2=12,x=4,d2/dx2=-12x=4为最大值,(x^2)y=(4)^2(6-4)=16x2=322.y=10-xx^2+y^2=x^2+(10-x)^2=...