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a:b = 5:6 - laczna suma stosunkow to 11
P=396 dm²
P= ½ × (a+b) × h
P= 12 × (a+b) = 396 dm²
a+b = 396/12 = 33
33:11 = 3
a = 5 × 3 = 15 dm
b = 6 × 3 = 18 dm
Zadanie rozwiązane :) Pozdrawiam i polecam sie na przyszłość :)