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Efectuati : a) 20:(225:9-65:13 = aul lam făcut b)17×(57:3-84:12)= c) 243:[61+80:(31-54:2)] = d)[(21×7+53×5):4-53]:10= e)65:{8-75:[(52:13+9)×2-1]}= f) {[7+51:(72:12+11)]×6-4}:4 = va rog ajutatima