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三年级学生最怕的新思维数学题，初中生不用方程很难解的题型2
三年级新思维数学中涉及到了和差问题，这类问题学了方程会很容易去解，但没有学方程的小学三年级生如何去解？和差问题有四种类型，本次视频主要是讲解如何不用方程去解和差问题的四类题型。这是第二类题型
三年级各知识点奥数题61/106
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