简算:1/1*3+1/3*5+1/5*7+1/7*9+1/9*11
简算:1/1*3+1/3*5+1/5*7+1/7*9+1/9*11
简算1*3/1+3*5/1+5*7/1+7*9/1+9*11/1+11*13/1+13*15/1+15*17/1+17*
(1/3+1/5+1/7+1/9)*(1/5+1/7+1/9+1/11)-(1/3+1/11+1/5+1/7+1/9)*
计算:1/3*5+1/5*7+1/7*9+1/9*11+1/11*13
计算:2/3*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
一道奥数题,简算(1/5+1/7+1/9+1/11)×(1/7+1/9+1/11+1/13)—(1/5+1/7+1/9+
9/7+1/8+3/8+5/7简算
5 7 -5 3 9 -1 11 -3 1
1-3+5-7+9-11+.
1 -3 5 -7 9 -11 13
1+3+5+7+9+11+.+99