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11+2×[3+(4+5×6):2]:5-13=

Răspuns :

11+2×(3+34:2):5-13=11+2×20:5-13=11+2×4-13=11+8-13=6
11+2×[3+(4+5×6):2]:5-13= 11+2×(3+34:2):5-13= 11+2×(3+17):5-13= 11+2×20:5-13= 11+40:5-13= 11+8-13=11-5= 6