摘要:在人教A版《数学》(选修2-2)教材中,关于"函数的单调性与导数",有这样一段表述:如图1,导数f'(x0)表示函数f(x)在点(x0,f(x0))处的切线的斜率。在x=x0处,f'(x0)〉0,切线是"左下右上"式的,这时,函数f(x)在x0附近单调递增;在x=x1处,f'(x1)〈0,切线是"左上右下"式的,这时,函数f(x)在x1附近单调递减。
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