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ریاضی را آسان بیاموزیم - اعداد گویا (کلاس دوم وسوم)

ریاضی را حفظ نکنیم با تمرین کردن یاد بگیریم

اعداد گویا (کلاس دوم وسوم)

نویسنده :رضا سازمند
تاریخ:چهارشنبه 3 آذر 1389-08:04 ب.ظ

اعداد گویا:
کلیه اعدادی که به توان بصورت کسری نوشت را اعداد گویا می گویند،بطوری که مخرج
آنها صفر نباشد.


جمع وتفریق اعداد گویا:


زمانی می توانیم کسر ها را با هم جمع یا از هم کم کنیم که مخرج ها

برابر باشند،در غیر اینصورت باید ابتدا مخرج مشترک بین آنها را بدست آورد

سپس با توجه به تساوی کسر ها صورت ها را نیز تغییر داده وبعد حاصل

جمع یا تفریق را بدست می آوریم.

طریقه مخرج مشترک گرفتن اعداد گویا:

1- اگر مخرج ها عدد اول بودند،برای گرفتن مخرج مشترک بین آنها،

اعداد را  در هم ضرب می کنیم.


2-اگر یکی از مخرج ها عدد اول ودیگری مرکب باشد،به طوری که

بر هم بخشپذیر نباشند در این حالت هم اعداد را در هم ضرب می کنیم.


3-اگر یکی از مخرج ها مخرج مشترک بین بقیه مخرج ها باشد،

در اینصورت آن عدد را  بعنوان مخرج مشترک در نظر می گیریم.


4-اگر رابطه ای بین مخرج ها وجود نداشت برای مخرج مشترک

گرفتن بین آنها از  (ک م م )استفاده می کنیم.



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