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策略一:数形结合例1函数f(x)=ax3+bx2+cx+d的图像如图所示,f′(x)为函数f(x)的导函数,则不等式x f′(x)≤0的解集为
Strategy 1: Combining Form 1 With f (x) = ax3 + bx2 + cx + d as shown in the figure, f ’(x) is the derivative of the function f Solution set ≤0