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120-[(63×2:6+109)×(75:25+21:3)]:10


Răspuns :

120-[(63×2:6+109)×(75:25+21:3)]:10=

120-[(21+109)x(3+7)]:10=

120-(130x10):10=

120-1300:10=

120-130=

= -10

Succes!