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When solving some math problems, we sometimes encounter many possible situations, which need to be classified and the types of diseases need to be found.
(1) Standard 1: Rational numbers can be divided into integers and fractions;
Standard 2: It can be divided into positive rational number, 0 and negative rational number.
(2) Standard 1: Real numbers can be divided into rational numbers and irrational numbers;
Standard 2, positive real number, 0, negative real number.