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小学数学应用题归类讲解 你知道什么是和差问题吗？
和差问题是小学数学中的常见题型，其中最好理解的方法就是画线段图，既直观，又形象，孩子们一看就懂，希望动手跟老师一起学习画一画吧
小升初必刷题97/152
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