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2014-11-17T19:58:18+02:00
A + b = 108
b = a x 5
a + a x 5 = 108
6a = 108
a = 108 : 6
a = 18
b = 18 x 5 
b = 90
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2014-11-17T19:58:39+02:00
A+b=108 a=5•b Inlocuim a cu 5•b 5•b+b=108 6•b=108 b=108:6=18 a=5•18=90 Deci a=90 si b=18
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