Odpowiedzi

2010-02-21T03:50:39+01:00
(b/c - b/a) / b/a = (a-c) / c
(ab -bc) / ac * a/b = (a-c) / c
[b*(a-c)] / c * 1/b = (a-c)/c
(a-c) / c = (a-c) / c