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42/1+56/1+72/1+90/1+110/1
人气:260 ℃ 时间:2020-01-25 23:54:25
解答
42/1+56/1+72/1+90/1+110/1
=1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11
=1/6-1/11
=5/66
=66分之5
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