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Daca a/b=0.75 si a+b=280, sa se afle numerele a si b.

Răspuns :

a/b egal 0.75⇒a egal 0.75b
inlocuim in relatia a plus b egal 280
0.75b plus b egal 28
1.75b egal 280
b egal 280/1.75⇒b egal 160
a egal 160*0.75⇒a egal 120