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Entry048Stage 3 · Grades 5–6数与代数

奇数与偶数

能被 2 整除的是偶数,不能的是奇数。

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Definition

是 2 的倍数的数叫偶数,不是的叫奇数。它们严格交替出现,加减之间藏着稳定的规律:偶±偶=偶,奇±奇=偶,奇±偶=奇。

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