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2010-04-14T19:38:43+02:00
A+a+3r+a+15r=63
3a+18r=63


(a+3)²=a(a+15r)
9a=2a+15ar
7a=15ar
Najlepsza Odpowiedź!
2010-04-14T19:40:08+02:00
{a+a+3r+a+15r=63
{(a+3)kwadrat=a(a+15r)

{3a + 18r = 63
{a² + 6a + 9 = a² + 15ar

{3a + 18r - 63 = 0
{6a - 15ar + 9 = 0