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5 年
美国初中数学竞赛真题,巧数长方形——一看就会做,一数肯定错 ...
罗数君定睛一看,这题可不算陌生,相信大多数人绝对在学生时代遇到过类似的题目。 要做这题不难,最笨的办法,就是硬数。罗数君有好多种数数儿办法,先来数数看! 先试试从左往右数或从上往下数:第一排无压力,第二排有点乱套,第三排逐渐模糊 ...
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