吧1/2看做1-1/2,5/6看做1-1/6原式=1-1/2+1-1/6+1-1/12.+1-1/90=1*9-（1/2+1/6+1/121/20+1/30+1/42+1/56+1/72+1/90）=9-（1-1/2+1/2-1/3+1/3-1/4+1/4.+1/8-1/8+1/9-1/9+1/10-1/10）=9-（1-1/10）=9-9/10=8又1/10注：1...网上的是1-1/2+1-1/6+1-1/12+1-1/20+1-1/30+1-1/42
=6-(1/2+1/6+1/12+1/20+1/30+1/42)
=6-6/7
=36/7
怎么解释?