在数学学习中，配凑法则是解决复杂问题的关键技巧之一，它通过灵活变形表达式，将问题转化为更易处理的形式，本文从实际应用出发，整理高中阶段常见的配凑方法，帮助读者掌握这一思维工具。 一、代数式配凑的核心思路 配凑的本质是构造可简化或可 ...

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DX-Adventure is thrilled to announce our upcoming VU4AX DX-pedition to the beautiful South Andaman Islands (IOTA AS-001).

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Feb. 3, 2025 — Maternal vitamin D levels in the first trimester were related to both prenatal growth and pregnancy outcomes, according to a new study. Low vitamin D levels during the first ...

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Breastfed infants and children with certain medical conditions are also susceptible to vitamin D deficiency. If a healthcare professional has recommended a vitamin D supplement for calcium ...

Joel, NF3R will be active as ZF2RJ from Cayman Islands, IOTA NA - 016, in ARRL DX SSB Contest, 1 - 2 March 2025.