Odpowiedzi

2010-04-10T14:05:40+02:00
2010-04-10T14:06:29+02:00
2010-04-10T14:08:46+02:00
1,8 dm = 18 cm
2*18cm= 36cm

4x+36cm=84 cm
4x=48
x=12

a=12 cm
b=12cm+18cm
b=30cm
P=a*b
P=12cm*30cm
P=360cm²