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180:2+[(100:10+90)+10]-100






Răspuns :

=90+((10+90)+10)-100
=90+((100+10)-100
=90+110-100
=200-100
=100
180: 2+[(10+90) +10]- 100
180: 2+[100+10]-100
180: 2+110-100
90+110-100
90+10=100