(1-1/2)*(1-1/3)*...*(1-1/1000)
(1-1/2)*(1-1/3)*...*(1-1/1000)
|1-1/2|+|1/3-1/2|+|1/4-1/3|+.+|1/1000-1/999|
|1-2/1|+|3/1-2/1|+|4/1-3/1|+.+|1000/1-999/1|
1+2+3+...+1000
2-3+1-1000
1×2×3~1000
计算 ( 1+1/2)*(1-1/3)*(1+1/4)*(1-1/5)*.*(1+1/1000)*(1-1/1001)
(1-1/2)*(1-1/3)*...*(1-1/999)*(1-1/1000)
1/1*2+1/2*3+1/3*4+.+1/998*999+1/999*1000
计算|1 - 1/2| +|1/3 - 1/2|+|1/4 - 1/3|+…+|1/1000 - 1/999|.
计算,|1-1/2|+|1/3-1/2|+|1/4-1/3|+……+|1/1000-1/999|.
计算|1-1\2|+|1\3-1\2|+|1\4-1\3|+…+|1\1000-1\999|