Odpowiedzi

2009-11-04T15:03:04+01:00
Pprostokąta=a*b
Pprostokąta=12xy+9x<do kwadratu> więc
a=3x
b=4y+3x
Obw=3x*2+(4y+3x)*2=6x+8+6x=12x+8y
2009-11-04T18:20:41+01:00
P=12xy + 9x²
1. bok = 3x
12xy + 9x²//3x
4y + 3x - 2. bok
Ob = 2 * 3x + 2* (4y + 3x)
Ob = 6x + 8y + 6x
Ob = 12x + 8y
2009-11-04T19:11:22+01:00
P=12xy + 9x²
1. bok = 3x
12xy + 9x²//3x
4y + 3x - 2. bok

Ob = 2 * 3x + 2* (4y + 3x)
Ob = 6x + 8y + 6x
Ob = 12x + 8y