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巧算1/20加1/30加1/42加.加1/132
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巧算 1/20加1/30加1/42加.加1/132
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答案和解析
1/20加1/30加1/42加.加1/132
=1/4-1/5+1/5-1/6+...+1/11-1/12
=1/4-1/12
=1/6
=1/4-1/5+1/5-1/6+...+1/11-1/12
=1/4-1/12
=1/6
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