Răspunsuri

2014-03-31T08:27:39+03:00
A-b=120b=20%a=20/100*a=20a/100 simplificam cu 20 b=a/5 inlocuim a*a/5=120 aducem la acelasi numitor comun [5a*a]/5=120   4a/5=120  ; a=120*5/4  120:4*5=150 deci a=150 b=a/5   =150/5   150:5=30  faci proba 150-30=120
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