(1/2+1/3+…+1/2011)(1+1/2+…+1/2010)-(1+1/2+…+1/2011)(1/2+1/3+…+1/2010)计算别做错啦
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(1/2+1/3+…+1/2011)(1+1/2+…+1/2010)-(1+1/2+…+1/2011)(1/2+1/3+…+1/2010)计算别做错啦(1/2+1/3+…+1/2011)(1+1/2+
(1/2+1/3+…+1/2011)(1+1/2+…+1/2010)-(1+1/2+…+1/2011)(1/2+1/3+…+1/2010)计算别做错啦
(1/2+1/3+…+1/2011)(1+1/2+…+1/2010)-(1+1/2+…+1/2011)(1/2+1/3+…+1/2010)计算
别做错啦
(1/2+1/3+…+1/2011)(1+1/2+…+1/2010)-(1+1/2+…+1/2011)(1/2+1/3+…+1/2010)计算别做错啦
(1/2+1/3+…+1/2011)(1+1/2+…+1/2010)
-(1+1/2+…+1/2011)(1/2+1/3+…+1/2010)
= [(1/2+1/3+…+1/2010) +1/2011] [1+ (1/2+…+1/2010)]
-[1+ (1/2+…+1/2010) + 1/2011](1/2+1/3+…+1/2010)
= 2012/2011(1/2+1/3+…+1/2010)+(1/2+1/3+…+1/2010)^2 + 1/2010(2011)
- 2012/2011(1/2+…+1/2010) - (1/2+…+1/2010)^2
= 1/2010(2011)
=1/4042110 #
(1-1+2/1)*(1-1+2+3/1)……(1-1+2+3……2011/1)
(1/2011-1)(1/2010-1)(1/2009-1)……(1/3-1)(1/2-1)
(1/2+2/3+…+2011/2012)×(1﹢1/2+2/3+…+2010/2011)-(1 1/2+…+2011/2012)×(1/2+2/3+…+2010/2011)1 1/2表示1又2分之一,
求值:(1/2+1/3+……+1/2012)*(1+1/2+1/3+……+1/2011)-(1+1/2+1/3+……+1/2012)*(1/2+1/3+……
2011-1/2×2011-1/3×(2011-1/2×2011)-...-1/2011×(2011-1/2×2011-...-1/2010×2011)
计算:(1-1/2)(1/3-1)(1-1/4)(1/5-1)……(1-1/2010)(1/2011-1)
(1/2013-1)(1/2012-1)(1/2011-1)…(1/3-1)(1/2-1)=
(1/2+1/3+…+1/2011)(1+1/2+…+1/2010)-(1+1/2+…+1/2011)(1/2+1/3+…+1/2010)计算别做错啦
(2011/1-1)(2010/1-1)(2009/1-1)…(3/1-1)(2/1-1)
计算:(1-1/2²)(1-1/3²)(1-1/4²)……(1-1/2010²)(1-1/2011²)
计算(1-1/2²)(1-1/3²)(1-1/4²)……(1-1/2011²)(1-1/2012²).
1+(-2)+3+(-4+)…+2011+(-2012)
求值(1/2+1/3+…+1/2012)*(1+1/2+1/3+…+1/2011)-(1+1/2+1/3+…+1/2012)*(1/2+1/3求值(1/2+1/3+…+1/2012)*(1+1/2+1/3+…+1/2011)-(1+1/2+1/3+…+1/2012)*(1/2+1/3+…+1/2011)
计算:1+2+3+…+2011+(-1)+(-2)+(-3)+…+(-2011) 求答案
(1/2011-1)(1/2010-1)(1/2009-1)…(1/3-1)(1/2-1)
1/1*2+1/2*3+1/3*4+……+1/2010*2011
1/1×2+1/2×3+1/3×4+……+1/2010×2011
计算 (-1)+(+2)+(-3)+(+4)+(-5)+…+(-2010)+(+2011)