1/15+1/35+1/63+1/99+1/143=

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/19 22:57:02

1/15+1/35+1/63+1/99+1/143
={[(1/3)-(1/5)]/2}+{[(1/5)-(1/7)]/2}+{[(1/7)-(1/9)]/2}+{[(1/9)-(1/11)]/2}+{[(1/11)-(1/13)]/2}
=[(1/3)-(1/5)+(1/5)-(1/7)+(1/7)-(1/9)+(1/9)-(1/11)+(1/11)-(1/13)]/2
=[(1/3)-(1/13)]/2
=(10/39)/2
=5/39

1/15+1/35+1/63+1/99+1/143 简算：3/1+15/1+35/1+63/1+99/1+143/1+195/1=? 30*(1/15+1/35+1/63+1/99+1/143+1/195)= 1/3+1/15+1/35+1/63+1/99+1/143=?怎样简便计算? 1/15+1/35+1/63+1/99+1/143= (1-1/15)+(1-1/35)+(1-1/63)+(1-1/99)+(1-1/143)+(1-1/195)+(1-1 1/3+1/15+1/35+1/63+1/99+1/143+1/195简便 1+1/15+3+1/35+5+1/63+7+1/99+9+1/143+11+1/195=? 1/3+1/15+1/35+1/63+1/99+1/143+1/195=?请简便计算. 1/15+1/35+1/63+1/99+1/143+1/195的简便算法（1/3+1/15+1/35+1/63+1/99+1/143）*80 30*(1/15+1/35+1/63+1/99+1/143+1/195) 简便方法