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Îmi rezolva cineva: 5×(x+9)>80
Vă rogggg...


Răspuns :

[tex]5*(x+9)\ \textgreater \ 80\\ 5x+45\ \textgreater \ 80\\ 5x\ \textgreater \ 35\\ x\ \textgreater \ 7=\ \textgreater \ x\ apartine\ (7,infinit)[/tex]
x+9>(80:5)
x+9>16
16-9=7
8+9>16