已知函数f(x)=ax^3+bx^2+cx+d(a,b,c,d∈R)的图像与x轴交于A,B,C三点.若点B的坐标为(2,0),且函数f(x)在区间[-1,0]和[4,5]上有相同的单调性,在区间[0,2]和[4,5]上有相反的单调性.(1)求c的值;(2)求b
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