Odpowiedzi

2010-02-03T21:15:58+01:00
P=0,5 r+3}
p+r=120}

p=0,5 r+3

0,5 r+3+r=120 |-3
1,5 r=117 |/1,5
r=78

p+78=120 |-75
p=42



3 3 3
2010-02-03T21:17:32+01:00
P+r= 120
p=0,5r +3

0,5r + 3 + r =120
1,5r +3 = 120
1,5r=117
r=78
p=42
Proszę ;)
3 2 3
2010-02-03T23:23:46+01:00
P+r=120
p=½r+3

½r+3+r=120
p=½r+3

1½r=120-3
p=½r+3

³/₂r=117 /*2
p=½r+3

3r=234 /:3
p=½r+3

r=78
p=½r+3=½*78+3=39+3=42

p=42
r=78
2 1 2