1/1×2+1/2×3+1/3×4+……+1/2010×2011
1/1*2+1/2*3+1/3*4+……+1/2010*2011
1/1×2+1/2×3+1/3×4+…+1/2010×2011+1/2012×2013
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
(2011/1-1)(2010/1-1)(2009/1-1)…(3/1-1)(2/1-1)
当x=2,1/2,3,1/3,4,1/4,…,2010,1/2010,2011,1/2011,时,
(1-2/1)(3/1-1)(1-4/1)(5/1-1)(1-6/1)……(1-2010/1)(2011/1-1)
请计算1/1*2+1/2*3+1/3*4+……+1/2010*2011等于多少
计算 (-1)+(+2)+(-3)+(+4)+(-5)+…+(-2010)+(+2011)
1-2+3-4+…+2009-2010+2011+2012
…+2009-2010+2011 1-2+3-4+5-6
计算:(1-1/2)(1/3-1)(1-1/4)(1/5-1)……(1-1/2010)(1/2011-1)