Ответ:
a) 5/4√5=5•√5/4√5•√5=5√5/4•5=√5/4
б) 5/(3+√13)=5(3-√13)/(3+√13)(3-√13)=5(3-√13)/(9-13)=-5(3-√13)/4
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Ответ:
a) 5/4√5=5•√5/4√5•√5=5√5/4•5=√5/4
б) 5/(3+√13)=5(3-√13)/(3+√13)(3-√13)=5(3-√13)/(9-13)=-5(3-√13)/4