1/6加1/12加1/20加1/30加1/42等于多少?

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1/6加1/12加1/20加1/30加1/42等于多少?1/6加1/12加1/20加1/30加1/42等于多少?1/6加1/12加1/20加1/30加1/42等于多少?

1/6加1/12加1/20加1/30加1/42等于多少?
1/6加1/12加1/20加1/30加1/42等于多少?

1/6加1/12加1/20加1/30加1/42等于多少?