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Afla numarul necunoscut:
187-[220x(50:25+4):a-53]=20


Răspuns :

187-{220 x [(11 x 9-735:15):25+4]:B - 53}=20

220 x [(99-49):25+4]:B - 53=187-20

220 x (50:25+4):B - 53=167


220 x (2+4):B =167+53

220 x 6:B =220

6:B=220:220

6:B=1

B=6x1

B=6
187-[220x(50:25+4):a-53]=20
220x(50:25+4):a-53=187-20
220x(50:25+4):a-53=167
220x(50:25+4):a=167+53
220x(50:25+4):a=220
220×6:a=220
1320:a=220
a=1320:220
a=6