计算,1x1/3-7/12+9/20-11/30+13/40-15/56=?,

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计算,1x1/3-7/12+9/20-11/30+13/40-15/56=?,计算,1x1/3-7/12+9/20-11/30+13/40-15/56=?,计算,1x1/3-7/12+9/20-11/

计算,1x1/3-7/12+9/20-11/30+13/40-15/56=?,
计算,1x1/3-7/12+9/20-11/30+13/40-15/56=?,

计算,1x1/3-7/12+9/20-11/30+13/40-15/56=?,
=1/3-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8)
=1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8
=0-0+0-0+0-1/8
= -1/8