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答和罩毁:1+3分之1-12分之7+20分之唤备9-30分之11+42分之13-56分之15
=1+1/3-(1/3+1/4)+(1/4+1/闷升5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8)
=1+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8
=1-1/8
=7/8
=1+1/3-(1/3+1/4)+(1/4+1/闷升5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8)
=1+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8
=1-1/8
=7/8
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