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2014-03-25T17:18:41+02:00
A+b=70
a=[3:4]·b 
din cele doua afirmatii⇒ a+b=70 ⇒ (3:4)·b +b =70 ⇒ (3b+4b): 4 =70 ⇒ 7b=70·4 ⇒ 7b =280  ⇒b=280:7 ⇒b=40
a=(3:4)·b ⇒ a=(3:4)·40 ⇒a=30