din enuntul problemei stim asa
(a1+a2)/2=x
(a3+a4+a5)/3=11x
(a6+a7+a8+a9)/4=88x
si noi trebuie sa aflam (a1+a2+a3+a4+a5+a6+a7+a9)/9= ?
(a1+a2)=2x
(a3+a4+a5)=33x
(a6+a7+a8+a9)=352x
adunam astea 3 ecuatii si avem
(a1+a2+a3+a4+a5+a6+a7+a8+a9)=387x
impartim ecuatia la 9
(a1+a2+a3+a4+a5+a6+a7+a8+a9)/9=387x/9=43x