1/3+1/7+1/9+1/11+1/33+1/_5+1/_5+1/_5+1/_5=1491/693+1/_5+1/_5+1/_5+1/_5=1前面我已算出,后面的意思我讲一下.1/3+1/7+1/9+1/11+1/33 再加上个位是5的四个单位分数(古称古埃及分数),和为1.若干个分母是奇数的单位分

简算:1/1*3+1/3*5+1/5*7+1/7*9+1/9*11 (1*3)/1+(3*5)/1+(5*7)/1+(7*9)/1+(9*11)/1 1/1*3+1/3*5+1/5*7+1/7*9+1/9*11 (1*3)/1+(3*5)/1+(5*7)/1+(7*9)/1+(9*11)/1 计算:1/3*5+1/5*7+1/7*9+1/9*11+1/11*13 1×3/1+3×5/1+5×7/1+7×9/1+9×11/1+11×13/1简便运算 计算：2/3*5+1/5*7+1/7*9+1/9*11+1/11*13 1/3+1/5+1/7+1/9+1/11+1/13+1/15= 1/3+1/5+1/7+1/9+1/11+1/13+...+1/99=? 1+3+5+7+9+11+.+99 1-3+5-7+9-11+13 1-3+5-7+9-11+.求救 1+3+5+7+9+11=? 1,3,5,7,9,11,15 计算:1-3 5-7 9-11 1/3+1/5+1/7+1/9+1/11+1/33+1/35+1/45+1/55+1/77 1/1*3+1/3*5+1/3*7+1/7*9+1/9*11怎样简算?为什么? 5 7 -5 3 9 -1 11 -3 1