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cum rezolv problema a+b=25 3a+2b=60??

Răspuns :

[tex]3a+2b=60 \\ a+b=25 \\ -------(-) \\ 2a+b=35=>b=35-2a \\ a+35-2a=25 \\ -a=-10|*(-1) \\ \boxed{a=10} \\ b=35-20 \\ \boxed{b=15} \\ [/tex]