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2x*5x=200
7x=200/ : 7
x=28 i 4/7 (cm)
28 4/7 cm = 2,8 4/7m
10x² = 200 || 10
x² = 20
x = √20 [w przybliżeniu 4,5]
2 * 4,5 = 9
5 * 4,5 = 22,5
ob = 2 * 9 + 2* 22,5
ob = 63cm