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Cel mai inteligent răspuns!
2014-08-18T16:58:21+03:00
1+3+5+.....+99=(1+99) 50\2=2500

radical din 2500=50 care este rational
k=_99-1):2+1=50
=> suma= (1+99)*50:2=2500
iar daca a²=2500 => a=50
sau , observi ca suma = 1+3+5+.....+99=(1+99)*50:2=100:2*50=50*50
Deci daca a²=50*50 => a=50