(1+1/2+1/3+1/4)Ãï¼1/2+1/3+1/4+1/5ï¼-ï¼1+1/2+1/3+1/4+1/5ï¼xï¼1/2+1/3+1/4ï¼
=ï¼1/2+1/3+1/4+1/5ï¼+ï¼1/2+1/3+1/4ï¼Ãï¼1/2+1/3+1/4+1/5ï¼-ï¼1/2+1/3+1/4ï¼-ï¼1/2+1/3+1/4+1/5ï¼Ãï¼1/2+1/3+1/4ï¼
=ï¼1/2+1/3+1/4+1/5ï¼-ï¼1/2+1/3+1/4ï¼
=1/5
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