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2*[90:2+(120:4-20)]*10

Răspuns :

2×[90:2+(120:4-20)]×10;
=2×[45+(30-20)]×10;
=2×(45+10)×10;
=2×55×10;
=110×10;
=1100;
2•[90:2+(30-20)]•10
2•(45+10)•10
2•55•10
111•10=1100