What does it mean that there is an n under the big U in mathematics that belongs to Z?

U stands for union, that is, two sets are merged;

N stands for natural number set, and N* stands for natural number set without 0.

Complex number set c real number set r positive real number set R+ negative real number set R- integer set z positive integer set Z+ negative integer set Z- rational number set q positive rational number set Q+ negative rational number set Q-

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Little knowledge of grams and kilograms in grade three

Registration conditions of Qiu Chengtong University Students' Mathematics Competition

The second day. There are still about 10 days before the mid-term exam. Is there any efficient review method? Let me talk about my situation.

Parity arithmetic in mathematics.

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What grade did you start learning negative numbers?

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