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dificil: {-5-5-5-6-20+[+550-590-(+30+60)]}​

Răspuns :

Răspuns:

{-5-5-5-6-20+[+550-590-(+30+60)]}

[-5-5-5-6-20+(+550-590-90)]

[-5-5-5-6-20+(-40-90)]

[-5-5-5-6-20+(-130)]

-41+(-130)

-171