一.2/(1*2*3)+2/(2*3*4)+2/(3*4*5)+...+2/(28*29*30)二.1/(1*2*3)+1/(2*3*4)+...+1/(8*9*10)+1/(9*10*11)三.1,2,3,4,.,109共109个数字,甲乙轮流擦去一个数,怎么擦才能保证最后剩下的两个数字互质四.用大小不同的两个半圆,
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![一.2/(1*2*3)+2/(2*3*4)+2/(3*4*5)+...+2/(28*29*30)二.1/(1*2*3)+1/(2*3*4)+...+1/(8*9*10)+1/(9*10*11)三.1,2,3,4,.,109共109个数字,甲乙轮流擦去一个数,怎么擦才能保证最后剩下的两个数字互质四.用大小不同的两个半圆,](/uploads/image/z/436834-10-4.jpg?t=%E4%B8%80.2%2F%281%2A2%2A3%29%2B2%2F%282%2A3%2A4%29%2B2%2F%283%2A4%2A5%29%2B...%2B2%2F%2828%2A29%2A30%29%E4%BA%8C.1%2F%281%2A2%2A3%29%2B1%2F%282%2A3%2A4%29%2B...%2B1%2F%288%2A9%2A10%29%2B1%2F%289%2A10%2A11%29%E4%B8%89.1%2C2%2C3%2C4%2C.%2C109%E5%85%B1109%E4%B8%AA%E6%95%B0%E5%AD%97%2C%E7%94%B2%E4%B9%99%E8%BD%AE%E6%B5%81%E6%93%A6%E5%8E%BB%E4%B8%80%E4%B8%AA%E6%95%B0%2C%E6%80%8E%E4%B9%88%E6%93%A6%E6%89%8D%E8%83%BD%E4%BF%9D%E8%AF%81%E6%9C%80%E5%90%8E%E5%89%A9%E4%B8%8B%E7%9A%84%E4%B8%A4%E4%B8%AA%E6%95%B0%E5%AD%97%E4%BA%92%E8%B4%A8%E5%9B%9B.%E7%94%A8%E5%A4%A7%E5%B0%8F%E4%B8%8D%E5%90%8C%E7%9A%84%E4%B8%A4%E4%B8%AA%E5%8D%8A%E5%9C%86%2C)
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