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a fost răspuns

afla numarul necunoscut (12×10-a×3)-125÷5=35

Răspuns :

(12x10-ax3)-125:5=35
(120-ax3)-25=35
120-ax3=25+35
120-ax3=60
ax3=120-60
ax3=60
a=60:3
a=20
proba:(120-20x3)-125:5=(120-60)-25=60-25=35
Marmota1
(120-3a)-25=35
120-3a-25=35
95-3a=35
3a=95-35=60
a=60:3=20