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Cel mai inteligent răspuns!
2014-08-26T15:17:08+03:00
a x b =40,
b x c=10,
c x a x b=80

cx40=80
x=80:40
c=2

bx2=10
b=10:2
b=5

ax5=40
a=40:5
a=8

Verificare:
8x5x2=40x2=80 ADEVARAT