1/1*1/2+1/2*1/3+1/3*1/4+.+1/2011*1/2012=

(1\2012-1)(1\2011-1)(1\2010-1)...(1\3-1)(1\2-1)=? (-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+.+(-1/2011*1/2012) 1/1*1/2+1/2*1/3+1/3*1/4+.+1/2011*1/2012= (-1×1/2)+(-1/2×1/3)+(1/3×1/4)+…+(-1/2011×1/2012)+(-1/2012×1/ 计算:(1/2-1)(1/3-1)(1/4-1)...(1/2010-1)(1/2011-1)(1/2012-1) |1/2-1|+|1/3-1/2|+|1/4-1/3|+...+|1/2012-1/2011|+|1/2013-1/20 (1/2012-1)(1/2011-1)(1/2010-1)...(1/3-1)(1/2-1)咋算 (2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1) 1/1×2+1/2×3+1/3×4+…+1/2010×2011+1/2012×2013 计算：1/(1*3)+1/(2*4)+1/(3*5)+...+1/(2011*2013)+1/(2012 *2014) 计算：|1/2-1|+|1/3-1/2|+|1/4-1/3|+|1/5-1/4|+……+|1/2012-1/2011|= 1*2/1+2*3/1+3*4/1+.2011*2012/1之和等于多少啦