1/5×8+1/8×11+1/11×14+……+1/98×101
1/5×8+1/8×11+1/11×14+……+1/98×101
日期：2022-04-12 11:49:55 人气：1
1/5×8+1/8×11+1/11×14+……+1/98×101
=1/3［(1/5-1/8)+(1/8-1/11)+(1/11-1/14)+……+(1/98-1/101)］
=1/3［1/5-1/101］
=1/3×96/505
=32&
=1/3［(1/5-1/8)+(1/8-1/11)+(1/11-1/14)+……+(1/98-1/101)］
=1/3［1/5-1/101］
=1/3×96/505
=32&