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Cel mai inteligent răspuns!
2014-11-14T22:03:33+02:00
Folosim formula lui Heron
A=√p(p-a)(p-b)(p-c) unde p=(a+b+c):2

p=(5+5+6):2=16:2=8
A=√8(8-5)(8-5)(8-6)=√8*3*3*2=√144=12
9 4 9