1/6+1/12+1/20+1/30+.1/2005x2006等于几,赏分啊
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![1/6+1/12+1/20+1/30+.1/2005x2006等于几,赏分啊](/uploads/image/z/14413691-11-1.jpg?t=1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%2B.1%2F2005x2006%E7%AD%89%E4%BA%8E%E5%87%A0%2C%E8%B5%8F%E5%88%86%E5%95%8A)
1/6+1/12+1/20+1/30+.1/2005x2006等于几,赏分啊
1/6+1/12+1/20+1/30+.1/2005x2006等于几,赏分啊
1/6+1/12+1/20+1/30+.1/2005x2006等于几,赏分啊
1/6+1/12+1/20+1/30+.1/2005x2006
=1/2-1/3+1/3-1/4+1/4-1/5+.+1/2005-1/2006
=1/2-1/2006
=501/1003