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Byabianca05
a fost răspuns

Afla necunoscuta:
458+3×{386+[48+2×(5×9-16×5)]}=2000

Răspuns :

Gandac
458+3×{386+[48+2×(5×a-16×5)]}=2000 |-458
3×{386+[48+2×(5×a-80)]}=1542 |÷3
386+[48+2×(5×a-80)]=514 |-386
48+2×(5×a-80)=128 |-48
2×(5×a-80)=80 |÷2
5×a-80=40
5a=40+80
5a=120
a=120÷5
a=24

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