|1-1/2|+|1/2-1/3|+|1/3-1/4|+...|1/9-1/10|
|1-1/2|+|1/2-1/3|+|1/3-1/4|+...|1/9-1/10|
|1-1/2|-|1/2-1/3|-|1/3-1/4|-.-|1/9-1/10|
/1/3-1/2/+/1/4-1/3/+/1/5-1/4/+.+/1/10-1/9/
(1-1/2^2)*(1-1/3)*(1-1/4^2)*…*(1-1/9^2)*(1/10^2)
计算|2/1-1|+|3/1-2/1|+|4/1-3/1| +…+|9/1-8/1|+|10/1-
简便方法计算 (1-1/^2)(1-1/^3)(1-1/^4)……(1-1/^9)(1-1/^10)
1/1*2*3+1/2*3*4+1/3*4*5+.+1/8*9*10
|3/1-2/1|+|4/1-3/1|+|5/1-4/1|+...+|10/1-9/1|=?3Q
计算:|1-1/2|+|1/2-1/3|+|1/3-1/4|+…+|1/9-1/10|
计算:|1-1/2|-|1/2-1/3|-|1/3-1/4|-……-|1/9-1/10|
|1-1/2|十|1/2-1/3|十|1/3-1/4|……|1/9-1/10|
(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10+1/11+1/12+1/13+1/14+1/