September 2018 1 34 Report
Tema: Adición de números naturales

Indique la propiedad aplicada en cada caso y halle la suma

a.12+(13+9)=(12+13)+9
b.23+15=15+23
c.(8+12)+4=4+(8+12)
d.17+0=17
e(3+2)+(4+9)=(3+2+4)

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