Question

Daca a+b=4020 , iar a-b=808 atunci cat este a si cat este b?

Answer 1

faci sistem $\left \{ {{a+b=4020} \atop {a-b=808}} \right. =\ \textgreater \ a+a+b-b=4020+808=\ \textgreater \ 2a=4828$$=\ \textgreater \ a= \frac{4828}{2} =\ \textgreater \ a=2414$
a+b=4020=> 2414+b=4020=> b= 4020-2414=> b=1606.