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126-[(63x2:6+109)x(75:25+21:3)]:10

Răspuns :

=126-[(126:6+109)x(3+7)]:10=
=126-[(21+109)x10]:10=
=126-(130x10):10=
=126-1300:10=
=126-130=
=-4

126-[(126:6+109)x(3+7)]:10=
126-[(26+109)x(3+7)]:10=
126-(135x10):10
126-1350:10=
126-135=
-9