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Dane:
ObwΔ/Obw pr = 2
ObwΔ = Obw pr + 3
a = ?
ObwΔ = 3a
ObwΔ/Obw pr = 2 / * Obw pr
ObwΔ = Obw pr + 3
ObwΔ = 2Obw pr
2Obw pr = Obw pr + 3
Obw pr = 3
ObwΔ = 2*3
ObwΔ = 6
ObwΔ = 3a
3a = 6 /:3
a = 2
Odp: Długość boku trójkąta wynosi 2.