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数学7上：简便计算3+7+11+15一直加到1995+1999，高斯求和基础题
数学7上：简便计算3+7+11+15一直加到1995+1999，高斯求和基础题
初中数学，有理数混合运算，简便计算，基础训练，培优专题168/395
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