Guía de Matemáticas para el examen de ingreso a la UNAM (Parte I) 1.1 Números Reales Naturales: Son los que se utilizan para contar. ( 1,2, 3, 4, 5,……, 19, 20, 21,………( Primos: Son los números que solo son divisibles entre si mismos y la unidad.
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