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初中数学：计算1×2+2×3+3×4+…+99×100，你觉得这方法怎么样
初中数学：怎么计算1×2+2×3+3×4+…+99×100，你觉得这方法怎样
初中数学，有理数混合运算，简便计算，基础训练，培优专题155/395
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