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b = a+7,5cm
Obw = 9,9dm = 99 cm
2a+2*(a+7,5) = 99
2a+2a+15 = 99
4a+15 = 99
4a = 99-15
4a = 84 /:4
a = 21
b = 21+7,5
b = 28,5
Sprawdzenie:
2*21+2*28,5 = 42+57 = 99
Zadanie 2
*ks. Jerzy Popiełuszko
*Ks. Wincenty Godlewski
*kapral Jerzy Spytek