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a) (-5)+(+7)-(+4)-(-2)
-5+7-4+2
-9+9
0
b) (-4)-(+2)-(+9)+(+20)
-4-2-9+20
-15+20
+5
EL VALOR ABSOLUTO:
a) 0= es 0
b) 5= es 5
2.-
5>0 ó 0<5
PARA QUE TE SAQUES BUENA NOTA