calcule:
A)+18-(-5)=
B)-157-74=
C)86-103=
E)-45+(+43)=

2)resolva as expressões númerica:
A)(+130)-(-18)+(-150)-(+31)=
B) (-46)+(+13)-(+51)-(-80)=
C)(+72)-(+37)-(-7)+(-22)=
D)(-63)-(+45)-(-9)+(-50)=
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