Odpowiedzi

2010-02-07T18:58:46+01:00
{x+y=200
0.3x+0.6y=o,4×200|×10
{x=200-y
3x+ 6y=800
{x=200-y
3×(200-y)+6y=800
{x=200-y
600-3y+6y=800
{x=200-y
3y=200|÷3
{x=200-y
y=66.6
{x=200-66.6
y=66.6
{x=133.3
y=66.6
2010-02-07T21:33:30+01:00
X + y = 200
0,3x + 0,6y = 0,4 × 200

y=200-x
0,3x+0,6y=80

0,3x+0,6(200-x)=80
0,3x+120-0,6x=80
-0,3x=-40
x=133,3

y=200-133,3
y=66,7