1.(-1)+(-1)^2+(-1)^3+…+(-1)^2011
(2011/1-1)(2010/1-1)(2009/1-1)…(3/1-1)(2/1-1)
1/1*2+1/2*3+1/3*4+……+1/2010*2011
(-1×1/2)+(-1/2×1/3)+(1/3×1/4)+…+(-1/2011×1/2012)+(-1/2012×1/
1/1×2+1/2×3+1/3×4+…+1/2010×2011+1/2012×2013
计算:(2011/1-1)(2010/1-1)(2009/1-1)…(3/1-1)(2/1-1)
(1-2/1)(3/1-1)(1-4/1)(5/1-1)(1-6/1)……(1-2010/1)(2011/1-1)
计算1/2+5/(2^2+2)+11/(3^3+3)+……+(2011^2+2011-1)/(2011^2+2011)
1*2/1+2*3/1+3*4/1+…2010*2011/1等于?
计算出 1×2/1+2×3/1+3×4/1+4×5/1+…………+2010×2011/1+2011×2012/1
1.(1/2+1/3+…+1/2003)(1+1/2+1/3+…+1/2004)-(1+1/2+1/3+…+1/2003
计算:(1-1/2)(1/3-1)(1-1/4)(1/5-1)……(1-1/2010)(1/2011-1)
(-1)+(-1)2次方+(-1)3次方+…+(-1)2010次方+(-1)2011次方