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rezolva:90-10-20-50+30+40-80

Răspuns :

90-10-20-50+30+40-80
60-50+30+40-80
40+40-80
80-80
0
90-10-20-50+30+40-80= 80-20-50+30+40-80= 60-50+30+40-80= 10+30+40-80= 40+40-80= 80-80= 0