Entry Nº 048Stage 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。
This page has no English version yet — the original Chinese text is shown below.
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。
Where it comes from · where it goes
Prerequisites
What builds on it
(none yet)