Răspuns :
Răspuns:
Salutare!
[(x+5)×5+5]×5+5=1 505
[(x+5)×5+5]×5=1 505-5
[(x+5)×5+5]×5=1 500
[(x+5)×5+5]=1 500:5
(x+5)×5+5=300
(x+5)×5=300-5
(×+5)×5=295
x+5=295:5
x+5=59
x=59-5
x=54
Verificare:
[(54+5)×5+5]×5+5=
(59×5+5)×5+5=
(295+5)×5+5=
300×5+5=
1 500+5=
1 505
Baftă!