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函数 f(x)在x =x0 处取得极限的点称之为“极限点” ;函数 f(x)在点x =x0 处连续的点称之为“连续点” ;函数 f(x)在x =x0 处有导数的点称之为“可导点” ;可导函数y =f(x)使 f′(x0 ) =0的点x0 叫做函数f(x) 的“驻点” ;函数 f(x)在x =x0 处取得极值 (极大值或极小值 )的点称
The point at which the function f(x) takes the limit at x =x0 is called the “limit point”; the point at which the function f(x) continues at the point x = x0 is called the “consecutive point”; the function f(x) is at The point at which x = x0 has a derivative is called the “guided point”; the derivative function y = f(x) makes the point x0 of f’(x0) = 0 called the “settlement point” of the function f(x); The point at which f(x) gets the extreme value (maximum or minimum value) at x =x0