(1/2+1/3)+(2/3+1/4)+(3/4=1/5)+(4/5+1/6)+···+(18/19=1/20)+(19/20+1/2)

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/27 12:57:35
(1/2+1/3)+(2/3+1/4)+(3/4=1/5)+(4/5+1/6)+···+(18/19=1/20)+(19/20+1/2)
xAN0y$&txC,ԀAゅY,taƠH\yCAW^a~3B]Mڦ{008ęc!B9̝rACnbk7( UcG]@YZU|SN |VgtYQGjf**@{}c1xYI9)a ^iЖ ?BJӷQߣ4vdo<06},|Qϛczd8 -ls3O_\3wr f-

(1/2+1/3)+(2/3+1/4)+(3/4=1/5)+(4/5+1/6)+···+(18/19=1/20)+(19/20+1/2)
(1/2+1/3)+(2/3+1/4)+(3/4=1/5)+(4/5+1/6)+···+(18/19=1/20)+(19/20+1/2)

(1/2+1/3)+(2/3+1/4)+(3/4=1/5)+(4/5+1/6)+···+(18/19=1/20)+(19/20+1/2)
第二项加第三项,第四项加第五项……一直到最后,答案应该是19

(1/2+1/3)+(2/3+1/4)+(3/4+1/5)+(4/5+1/6)+···+(18/19+1/20)+(19/20+1/2)
=1/2+1/3+2/3+1/4+3/4+1/5+4/5+1/6+5/6+……+18/19+1/20+19/20+1/2
=1/2+1/2(最后的1/2)+(1/3+2/3)+(1/4+3/4)+……+(19/20+1/20)
=1+1+1+1+……+1
(因为分母是2,3,4,5,6……,20)共有19个1
=19