简算:1/13+1/35+1/57+1/79+1/9*11

来源：学生作业帮助网编辑：作业帮时间：2024/04/24 00:38:07

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:1/1*3+1/3*5+1/5*7+1/7*9+1/9*11
1/1*3+1/3*5+1/5*7+1/7*9+1/9*11
=(1/2)(1/1-1/3)+(1/2)(1/3-1/5)+(1/2)(1/5-1/7)+(1/2)(1/7-1/9)+(1/2)(1/9-1/11)
=(1/2)[1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11]
=(1/2)(1-1/11)
=(1/2)(10/11)
=5/11

1/1*3+1/3*5+1/5*7+1/7*9+1/9*11
=1/2*[(1/1-1/3)+(1/3-1/5)....+(1/9-1/11)]
=1/2*[1-1/11]
=5/11

简算:1/1*3+1/3*5+1/5*7+1/7*9+1/9*11
==1/2*[(1/1-1/3)+(1/3-1/5)....+(1/9-1/11)]
=1/2*[1-1/11]
=5/11

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/(99*101)= 简算1/1*3+1/3*5+1/5*7+...1/99*101 .一道算式简算1/1×3+1/1×5+1/5×7+.+1/1997×1999 1/7 7/8×5/7 3/8 简算 (1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7) 简算(1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7) 简便计算简算（5/9×7/10-1/3）×6/5 5/7×[7/8-(1/2＋3/8)]简算 (4/5+1/4)/3/7+7/10简算 15/49除(5/7-3/14*1/3) 简算 (1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7) 简算简算（2+3+1/5）+（2/3-5/17）-（1/5+12/7） 18*(7/9+1/3-5/6)简算 1+3+5+7……+99简算 1+2+3+4+5+6+7+8+9简算简算,1+3+5+7+9+11+13= (5/7-1/2)÷(10/21-3/10) 简算简算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*19/1