F(-1)=-1/3a+b-c=0 F(x)的导数在x=1时,F(x)=0,F(1)=-21/3a+b+c=-2,a+2b+c=0a=9/2b=-1c=-5/2F(x)=3/2x的立方-x平方-5/2xF(x)导数=(9x+5)(x-1)令F(x)导数=(9x+5)(x-1)=0,x=-5/9,x=1,在x=-5/9时取极大值,单调增区间时,F(x)导数=(9x+5)(x-1)>0,x>1,x
