A)(-9)-(+7)+(+13)-(-20)=
B)(-11)+(-7)+(+18)=
C)(-51)+(-82)-(-12)-(+7)=
D)(-9)+(+10)-(+3)-(+20)=
E)(-1)+(-17)-(+18)=

(2)qual o valor de A?
(3)qual o valor de B?
(4)qual o valor de C?
(5)calcule o valor de A-B-C
ME AJUDEM AINDA HOJE
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