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calculati 47502:[17+3-(34:2+123:3)+10*5+9]_123 =

Răspuns :

=47502:[17+69-(17+41)+50+9]-123
=47502:[17+69-58+50+9]-123
=47502:[86-58+50+9]-123
=47502:[28+50+9]-123
=47502:[78+9]-123
=47502:87-123
=546-123
=423