1/1×1/2+1/2×1/3+1/3×1/4+…+1/29×1/30
小学六年级数学题:1/1*2+1/2*3+1/3*4+.+1/29*30=?
1*2/1 + 2*3/1 + 3*4/1 +.+29*30/1
1/(1-1/2)/(1-1/3)/(1-1/4)/……/(1-1/2012)
(-1*2/1)+(-1/2*1/3)+(-1/3*1/4)+…+(-1/2012*1/2013)
计算:(1+1/2)(1+1/3)(1+1/4)…(1+1/2010)(1/2-1)(1/3-1)(1/4-1)…(1/
计算:(1-1/2)*(1-1/3)*(1-1/4)*……*(1-1/10).
200×(1-1/2)×(1-1/3)×(1-1/4)×……×(1-1/100)=?
| 1/3 - 1/2 | + | 1/4 - 1/3 | + | 1/5 - 1/4 | …… + | 1/2009
(-1×1/2)+(-1/2×1/3)+(1/3×1/4)+…+(-1/2011×1/2012)+(-1/2012×1/
(1-1/2-1/3-1/4-……-1/2003)(1/2+1/3+1/4+...+1/2004)-(1-1/2-1/3
求和:1/1×2+1/2×3+1/3×4+……+1/n(n+1)
简便方法计算 (1-1/^2)(1-1/^3)(1-1/^4)……(1-1/^9)(1-1/^10)