Răspunsuri

2014-04-04T00:26:59+03:00
A²-b²=30          a+b=5
a²-b²=(a-b)(a+b)=30
             5(a-b)=30
               a-b=6
2014-04-04T00:28:52+03:00
(a + b) x (a - b) = a² - b² ⇒ 5 x (a - b) = 30 => a - b = 6