Respuesta:
[tex] + ( + 9) + ( - 2) = 7 \\ 9 + ( - 2) = 7 \\ 7 = 7[/tex]
[tex]( - 4) + 7 = 11 \\ 11 = 11 [/tex]
[tex] + ( + 7) + ( - 4) = 3 \\ 7 + ( - 4) = 3 \\ 3 = 3[/tex]
[tex]3 + 2 = 5 \\ 5 = 5[/tex]
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Respuesta:
[tex] + ( + 9) + ( - 2) = 7 \\ 9 + ( - 2) = 7 \\ 7 = 7[/tex]
[tex]( - 4) + 7 = 11 \\ 11 = 11 [/tex]
[tex] + ( + 7) + ( - 4) = 3 \\ 7 + ( - 4) = 3 \\ 3 = 3[/tex]
[tex]3 + 2 = 5 \\ 5 = 5[/tex]