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270-149×5-520÷5-1780÷10

Răspuns :

270-149×5-520:5-1780:10=
270-745-520:5-1780:10=
270-745-104-1780:10=
270 - 745 - 104-178 =
270-(745+104+178)=
270-(849+178)=
270-1027=
-757