Odpowiedzi

2009-12-17T11:41:18+01:00
X+y=30 /* (-1)
2x - 4 + y = 20

-x-y=-30
2x-4+y=20

x-4=-10
x=-6

-6+y=30
y=36
2009-12-17T11:42:03+01:00
X+y
------ = 15
2

(x-2)+½y
------------ = 10
2
2009-12-17T11:42:22+01:00
X- pierwsza liczba
y- druga liczba

x+y=15
x-2+ 1/2y=10
x=15-y
15-y-2+1/2y=10
x=15-y
1/2y+13=10 |-13
x=15-y
1/2y=-3 |*2
x=15-y
y=-6
x=15-(-6)
y=-6
x=21
y=-6