Odpowiedzi

2009-12-07T14:17:28+01:00
¼(10y+x)=X+y || *4
100y + x = 8,5 (10y + x )

10y+x=4x+4y
100y+x=85y+8,5x

6y-3x=0 ||*5
15y-7,5x=0 ||*2

30y-15x=0
30y-15x=0
- -----------------------
0=0
x∈R
y∈R


Sadze ze jest ok ;)
2009-12-07T14:19:31+01:00
1/4(10y+x)=x+y
100y + x =8,5 (10y+x)

10/4y + 1/4x = x+y
100y + x = 85y + 8,5x

1i1/2y = 3/4x -> x = 6y
15y = 7,5x / 7,5 -> x = 2y