1-1/2+1/3-1/4+1/5+1/6+1/7-----------+1/199-1/200

1-1/2+1/3-1/4+1/5+1/6+1/7-----------+1/199-1/200 (1+3+5+7+...+199)/(2+4+6+...+200)= 1+(1/1+2)+(1/1+2+3)+(1/1+2+3+4)+~+(1/1+2+3+4+5+6+7+8+9+~+199 1/2+3/2+5/6+7/8+.+199/200 1/1*2+1/2+3+1/3*4+1/4*5+……+1/199*200 (1+1/2)*(1+1/4)*(1+1/6)*(1+1/8)*(1+1/3)*(1+1/5)*(1+1/7)*(1+1 (1-1/2^2)(1-1/3^2)(1-1/4^2)(1-1/5^2)(1-1/6^2)(1\1/7^2)(1-1/8 1/2+1/2*1/3+1/3*1/4+1/4*1/5+1/5*1/6+1/6*1/7+.1/1999*1/2000得多 1、求|1-1/2|+|1/2-1/3|+|1/3-1/4|+|1/4-1/5|+|1/5-1/6|+|1/6-1/7| 简便计算:1/1×2+1/2×3+1/3×4+...+1/199×200 1+3+5+7+...+199/2+1+6+8+...+200 等于多少 （1）1+1/2+1/3+1/4+1/5+1/6+1/7+1/14+1/28