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AJUTOOOOOR!!!Intr-o ferma sunt gaini si iepuri :159 capete si 452 picioare .Cati iepuri sunt in ferma?

Răspuns :

a=gaini
b=iepuri
a+b=159       b=159-a
2a+4b=452
2a+4(159-a)=452
2a+636-4a=452
2a=184
a=92 gaini
b=159-92=67 iepuri
a=gaini
b=iepuri
a+b=159
2a+4b=452
2a+2b+2b=452
2*(a+b)+2b=452
2*159+2b=452
318+2b=452
2b=452-318
2b=134
b=134:2
b=67
a+67=159
a=159-67
a=92