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
42/1＋56/1＋72/1＋90/1＋110/1
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