👤

{20-[30+(40-40:a):5]:6}:7=2

Răspuns :

{20-[30+(40-40:a):5]:6= 7×2 Copii=14 20-[30+(40-40:a):5=14×6 Copii =84 30+(40-40:a):5=84-20 30+(40-40:a):5=64 (40-40:a):5=64-30 (40-40:a):5=34 5-5:a=34 -5a=34-5 -5a=29 a=29:5
{20-[30+(40-40÷a)÷5]÷6}÷7=2<=>20-[30+(40-40÷a)÷5]÷6=14<=>-30-(40-40÷a)÷5=-36<=>-40+40÷a=-30<=>40÷a=10=>a=40÷10=4.