Classic mistakes

1、 When judging breakpoints and their types , Deform the function , Notice whether the denominator is equal to 0 Factor elimination of . In this way, it is possible to eliminate the discontinuity .—— 259 topic

Common ideas

1、 Use of bounded conditions ： bounded x An infinitesimal = An infinitesimal —— 260 topic

Daily question and process

259： belt x^n The limits of （ Limit definition function ）

 【 Classic mistakes 】 When judging breakpoints and their types , Deform the function , Notice whether the denominator is equal to 0 Factor elimination of . In this way, it is possible to eliminate the discontinuity . Wrong choice C.

 【 Ideas 】

  First of all, think of

  Add ：

 260： Use of bounded conditions

 【 Ideas 】f(x) stay 1 Continuous , Then the limit value is equal to 1 Function value , Want function value , Convert to limit value , Look at the questions , The limit you want is on the molecule , Its denominator is 0（ An infinitesimal ）, The thought of bounded x An infinitesimal = An infinitesimal .

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