"numeros enteros"
a) 2+(-1+3)-(-1-2)-1
b)-2-(-1+3)+(-1-2)-1
c)2+(1-3)+(-1+2)+1
d)-2-(1+3)-(1+3)+1
a) 2+(-1+3)-(-1-2)-1
b)-2-(-1+3)+(-1-2)-1
c)2+(1-3)+(-1+2)+1
d)-2-(1+3)-(1+3)+1
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2+(-4)+(-4)+1
2+0+1=3