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Daca a+b=1 si 2a/5=3b/7 ,aflati numerele a si b

Răspuns :

2a/5=3b/7=> 2a=15b/7=> a=15b/14
a+b=1=> 15b/14+b=1| *14=> 15b+14b=14=> b=14/19=> a=15/19