1/1×2×3×4+1/2×3×4×5+1/3×4×5×6+……+1/17×18×19×201/(1×2×3×4)+1/(2×3×4×5)+1/(3×4×5×6)+……+1/(17×18×19×20)

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/26 01:34:08
xP 0]ǹ(2gdE%4Pct)uVr0P {w =KvtV9[,cl$F6xC[g[i<,AHE8'If{H5rfܦVXC%zHQ}4RM%qG<-[<҆s`VIJ/+#f>س
1 2 3 4 5 1 2 1+1+2+2+3+4+5 1+1 2+2 3+3 4+4 5+5 1,2,3,4,5 1,2,3,4,5, 1 2 3 4 5 1,2,3,4,5 1,2,3,4,5, 1 2 3 4 5 1,2,3,4,5, .1,2,3,4,5, 1,2,3,4,5, 1,2,3,4,5, 1 2 3 4 5 1、2、3、4、5 1,2,3,4,5, 3,4,5,1,2 1、2、3、4、5