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Obówód = 5/7x + 2x
38 = 5/7 x + 2x
38 = 2 i 5/7 x
38 = 19/7 x / dzielimy na 19/7
38 : 19/7 = x
38 * 7/19 = x
14 = x
Odpowiedź 5/7 * 14 = 10
a- 10 , b - 14
Sprawdzenie : Obwód = a + 2b czyli 10+2*14 = 10+28 = 38