10/1*2+20/1*2*3+30/1*2*3*4+.+90/1*2*3*...*10
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/05/22 06:05:18
10/1*2+20/1*2*3+30/1*2*3*4+.+90/1*2*3*...*10
*=乘号 /=分数线
*=乘号 /=分数线
3628799/362880
10/(1*2)+20/(1*2*3)+30/(1*2*3*4)+40/(1*2*3*4*5)+...+90/(1*2*
10/(1*2)+20/(1*2*3)+30/(1*2*3*4)+40/(1*2*3*4*5)++...+90/(1*2
1*2*3+2*4*6+...10*20*30/2*3*4+...+20*30*40
1+2+3+4+10+20+30+40+1234=?
1*2*3+2*4*6+3*6*9+.10*20*30 ______________________________ 2
|1-1/2|+|1/2-1/3|+|1/3-1/4|+...|1/9-1/10|
|1-1/2|-|1/2-1/3|-|1/3-1/4|-.-|1/9-1/10|
4.{1,5,10}{2,10,20}{3,15,30}{4,20,40}{ }.
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)(用简算)
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=R
简算:(1+1/3+1/5+1/10+1/15+1/30)÷(1/2+1/4+1/6+1/12+1/20+1/60)=?
(1+1/3+1/5+1/10+1/15+1/30)÷(1/2+1/4+1/6+1/12+1/20+1/60)