Respuesta :

Aaronwu

Answer:

9-(-3)=9+3=12    -1-(-2)=-1+2=1

Step-by-step explanation:

-(-x)=+x

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kesme981

Answer & Step-by-step explanation:

[tex]9-(-3)[/tex]

Two negatives makes a positive, so change the symbol to a positive:

[tex]9+3=12[/tex]

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[tex]-1-(-2)[/tex]

Two negatives makes a positive, so change the negative 1 'minus negative' two to an addition sign:

[tex]-1+2=1[/tex]