March 2021 0 28 Report
5_ Escribe en cada caso, el valor de la letra y la propiedad de la adición que se utiliza
a. 45+ (-8 + x) = 045 +(-8)] +(-7)
b. 13 +y = 0
C. - 23 +54 =X+(-23)
d. 27+(-27) = 2​

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