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-5-{[-3÷3]-12÷-2}+√4=
-5-{-1-12÷-2}+√4=
-5-{-13÷-2}+2=
-5+13÷2+2=
8÷4=
=2 R//
-5-{[(-3) : raíz de 9 ] -12:(-2)} + raíz de 4 -5-{[ -3 : 3 ] -12 : -2 } + raíz de 4
-5-{ -1 -12: -2 } + raíz de 4
-5-{ -1-6} + raíz de 4
-5-{ -7 } +raiz de 4
-5+7+2
-5+9 = 4
RESPUESTA: 4