Explicación paso a paso:
[tex]( + 20) + ( - 10) \\ 20 - 10 \\ 10[/tex]
[tex]( - 8) + ( + 3) \\ - 8 + 3 \\ - 5[/tex]
[tex]( + 11) + ( - 2) \\ 11 - 2 \\ 9[/tex]
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Explicación paso a paso:
[tex]( + 20) + ( - 10) \\ 20 - 10 \\ 10[/tex]
[tex]( - 8) + ( + 3) \\ - 8 + 3 \\ - 5[/tex]
[tex]( + 11) + ( - 2) \\ 11 - 2 \\ 9[/tex]