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ریاضی را آسان بیاموزیم - ادامه تدریس اعداد اول ومرکب(کلاس سوم)

ریاضی را حفظ نکنیم با تمرین کردن یاد بگیریم

ادامه تدریس اعداد اول ومرکب(کلاس سوم)

نویسنده :رضا سازمند
تاریخ:سه شنبه 23 شهریور 1389-08:32 ق.ظ

ادامه تدریس اعداد اول ومرکب:

نکته:عدد یک،نه اول است ونه مرکب(پس در روش الگاریتم غربال همیشه روی آن را خط می زنیم)

نکته:زمانی که در سوالی فقط بخواهند ثابت کنیم عددی اول است یا مرکب،کافی است اعداد اول کوچکتر

از مجذور نزدیک به آن عدد را پیدا کرده ،تقسیم بر آن عدد نماییم اگر باقی مانده تقسیم ها صفر نشد آن

عدد اول است،اما اگر فقط در یکی از تقسیم ها باقی مانده صفر شد آن عدد مرکب می باشد.




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