1/4+1/12+1/24+1/40.+1/19800
1/4+1/12+1/24+1/40.+1/19800
4/1+12/1+24/1+40/1+.19800/1
4/1 12/1 24/1 40/1 . 19800/1怎么算?等于多少?
如何巧算1/4+1/12+1/24+1/40+.+1/19800
1/4+1/12+1/24+1/40……+1/19800=?
4分之1+1/12+1/24+1/40…+1/19800
1/4+1/12+1/24+1/40+……+1/19800=?
1,4,12,40.的通项公式
1/4+1/12+1/24+1/40+1/84+1/112+1/144+1/180
(-1/4+1/6-1/8+1/12)*(-24)
巧算1/4+1/12+1/24+1/40+1/60+1/84+1/112
1/4+1/12+1/24+1/40+1/60+1/84+1/112