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Vecinul are atatea pasari cate oi. Stiind ca patrupedele au in total 18 picioare in plus, afla cate pasari are vecinul

Răspuns :

p=o
4o=2p+18
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4o=2o+18
2o=18
o=9 oi
p=o=9 pasari
Verificare: 9x4=36=2x9 + 18=18+18=36, corect.