👤

[(a×5+6×8)-11 ] ÷9 +4= 12

Răspuns :

[(a×5+6×8)-11]:9+4=12
=[(a×5+48)-11]:9=12-4
=[(a×5+48)-11]:9=8
=(a×5+48)-11=8×9
=(a×5+48)-11=72
=a×5+48=72+11
=a×5+48=83
=a×5=83-48
=a×5=35
a=35:5
a=7

Mult succes! (Am rezolvat prin metoda mersului invers)
[(ax5+48)-11]:9=12-4=8
[(ax5+48)-11]=8x9=72
(ax5+48)=72+11=83
ax5=83-48= 35
a=35:5
deci a = 7