(1)1-1/2-1/6-1/12-1/20-...-1/9900(2)1/2+1/6+1/12+1/20+...+1/
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:2024/09/30 03:33:32
(1)1-1/2-1/6-1/12-1/20-...-1/9900(2)1/2+1/6+1/12+1/20+...+1/9900(3)1/3+1/15+1/35+1/63+...+1/9999
(1)1-1/2-1/6-1/12-1/20-...-1/9900
=1/2-(1/2-1/3)-(1/3-1/4)-……-(1/99-1/100)
=1/2-1/2+1/3-1/3+1/4-……-1/99+1/100
=1/100
(2)1/2+1/6+1/12+1/20+...+1/9900
=1-1/2+1/2-1/3+1/3-1/4+……+1/99-1/100
=1-1/100
=99/100
(3)1/3+1/15+1/35+1/63+...+1/9999
=1/2*(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+……+1/99-1/101)
=1/2*(1-1/101)
=50/101
=1/2-(1/2-1/3)-(1/3-1/4)-……-(1/99-1/100)
=1/2-1/2+1/3-1/3+1/4-……-1/99+1/100
=1/100
(2)1/2+1/6+1/12+1/20+...+1/9900
=1-1/2+1/2-1/3+1/3-1/4+……+1/99-1/100
=1-1/100
=99/100
(3)1/3+1/15+1/35+1/63+...+1/9999
=1/2*(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+……+1/99-1/101)
=1/2*(1-1/101)
=50/101
1/2+1/6+1/12+1/20+.+1/9900
1/2+1/6+1/12+1\20+1/30+1/42+.+1/9900=?
1/2+1/6+1/12+1/20+1/30+...+1/9702+1/9900
2/1+6/1+12/1+20/1+30/1+42/1+.+9900/1
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+.1/9900
1-1/2-1/6-1/12-1/20-.-1/9900
1/2+1/6+1/12+1/20+1/30+……+1/9900 是多少?
1/2+1/6+1/12+1/20+1/30+.+1/9900=?
1/2+1/6+1/12+1/20……1/9702+1/9900=?
谁知道 2/1+6/1+12/1+20/1+30/1+…+9900/1 等于多少?
1/2+1/6+1/12+1/20+1/30+...+1/9900怎么算
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+.1/9900=?