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ریاضی را آسان بیاموزیم - توان(کلاس دوم)

ریاضی را حفظ نکنیم با تمرین کردن یاد بگیریم

توان(کلاس دوم)

نویسنده :رضا سازمند
تاریخ:سه شنبه 23 شهریور 1389-06:35 ب.ظ

توان:خلاصه ضرب یک عدد در تعدادی از همان عدد را توان می گویند.

۲×۲×۲×۲×۲=۲۵

که ۲ را پایه  و ۵  را توان می گویند.

قوانین توان:

در ضرب:۱-اگر پایه ها مساوی توانها مختلف باشند؛در این صورت یکی از پایه ها را نوشته،توانها را با هم جمع می کنیم.

۲-اگر پایه ها مختلف توانها مساوی باشند؛در اینصورت پایه ها را در هم ضرب کرده،و یکی از توانها را می نویسیم.

در تقسیم:۱-اگر پایه ها مساوی توانها مختلف باشند؛در این صورت یکی از پایه ها را نوشته،توانها را از هم کم می کنیم.

۲-اگر پایه ها مختلف توانها مساوی باشند؛در اینصورت پایه ها را بر هم تقسیم کرده،و یکی از توانها را می نویسیم.

نکته:اگر بالای عددی توان نداشت،توان آن عدد را یک ذر نظر می گیریم.

نکته:در قانون دوم تقسیم توانها  اگر پایه ها بر هم بخشپذیر نبودند،آنها را بصورت کسری داخل پرانتز

 قرار داده، یکی از توانها رابیرون پرانتز بالای دو عدد قرار می دهیم.




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