1/55+1/66+1/77+1/88+1/99

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1/55+1/66+1/77+1/88+1/99

1/55+1/66+1/77+1/88+1/99
1/55+1/66+1/77+1/88+1/99

1/55+1/66+1/77+1/88+1/99
提取公因式1/11
等于1/11(1/5+1/6+1/7+1/8+1/9)
=1/11((5+6+7+8+9)/5*6*7*8*9)
=1/11(5*7/5*6*7*8*9)
=1/11*1/432
=1/4752