1、y'=-3x²-4mx-m²x=2,y'=-12-8m-m²切线和y=-5x+12平行即x=2,切线斜率=-12-8m-m²=-5m²+8m+7=0m>-2所以m=-12、f(x)=-x³+2x²-x+2f'(x)=-3x²+4x-1=0x=1,x=1/3f'(x)向下所以x<1/3,x>1,f'(x)<0,减函数1/30,增函数所以在[0,1]中,0所以x=1/3最小所以最小值=f(1/3)=50/27