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180:2x[(50x2:10+90)+10]-25x4
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Răspuns :

90+[(100:10+90)+10]-100
90+(100+10)-100
90+110-100
90+10
100

180:2x[(50x2:10+90)+10]-25x4=
=180:2x[(100:10+90)+10]-25x4
=180:2x[(10+90)+10]-25x4
=180:2x(100+10)-25x4
=180:2x110-25x4
=90x110-25x4
=9900-100
=9800