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509+345-12:2x(23x45)=...............................................................

Răspuns :

509+345-12:2x(23x45)=
509+345-6×1035=
509+345-6210=
-5356
509+345-12:2x(23x45)=
509+345-6x1035=
509+345-6210=
6210-854=
5356