ghesmat alef)dar makhrage kasrha mozdavag minevisim masalan a^2+(b-c)*-a hal az a factor migirim vabegaye a+c ,-b mighozarim dar natige makhrage kasr be 2*b*a tabdil mishavad ha ba ye makhrag moshtarak gereftan hokm mored nazar natige mishavad
ghesmat gim)az taghir motaghayer...