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b=4cm
Obw. 8cm*2+4cm*2=24cm
Odp Jeden bok ma 4 cm a drugi 8 cm
x=2y
2y+y=12cm
x=2y
3y=12cm
x=2y
y=4
x=2*4
y=4cm
x=8cm
sprawdzenie. 4cm+4cm+8cm+8cm=24cm
24 cm : 6 = 4 cm
2 * 4 cm = 8 cm
a = 4 cm
b = 8 cm