Odpowiedzi

2009-12-13T17:06:26+01:00
(p/100) *6+(r/100)*8=5 /*10
(r/100) *6 + 8 + 8*(p/100)=12,8 /*10

6p+8r=500
6r+800+8r=1280

6p+8r=500
8p=6r=1280-800

6p+8r=500 /*8
8p+6r=480 /* (-6)

48p+64r=4000
-48p-36r=-2880
----------------------dodaj
28r=1120
r=40

6p+8r=500
6p=500-8r
p=250/3-8/6*40
p=30