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3×[90:45+2×(69:13+10)]+105:3

Răspuns :

3×[90:45+2×(69:13+10)]+105:3= 3×[90:45+2×(5+10)]+105:3= 3×(90:45+2×50)+105:3= 3×(2+100)+105:3= 3×102+105:3= 306+35=341