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38 = 38 Propiedad conmutativa
D- 17+0=17 Elemento neutro
17 = 17
A- 12+(13+9)=(12+13)+9
12+ 22 = 25 +9
34 = 34 Asociativa
E- (3+2)+(4+9)=(3+2+4)
5 + 13 = 9
18 Asociativa
C- (8+12)+4=4+(8+12)
20 +4 =4+ 20
24 = 24 Asociativa