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Daca a +b=4,5 si a - b = 0,5 aflati a si b



URGENT VA ROG


Răspuns :

[tex] \left \{ {{a+b=4,5} \atop {a-b=0,5}} \right. \\ ------\\ 2a+0=5=\ \textgreater \ 2a=5=\ \textgreater \ a=2,5\\ 2,5+b=4,5=\ \textgreater \ b=4,5-2,5=\ \textgreater \ b=2\\ V:2,5+2=4,5\\ ~~~2,5-2=0,5 [/tex]