设函数f(x)=-1/3x^3+2ax^2-3a^2x+b,0
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f'(x)=-x^2+4ax-3a^2=-(x-3a)(x-a) 负无穷到a单调减,a到3a单调增,3a到正无穷单调减
f'(x)对称轴为2a
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