|1/11-1/12|+|1/12-1/13|+|1/13-1/14|+|1/14-1/15|=?这题怎么算?
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|1/11-1/12|+|1/12-1/13|+|1/13-1/14|+|1/14-1/15|=?这题怎么算?|1/11-1/12|+|1/12-1/13|+|1/13-1/14|+|1/14-1/1
|1/11-1/12|+|1/12-1/13|+|1/13-1/14|+|1/14-1/15|=?这题怎么算?
|1/11-1/12|+|1/12-1/13|+|1/13-1/14|+|1/14-1/15|=?
这题怎么算?
|1/11-1/12|+|1/12-1/13|+|1/13-1/14|+|1/14-1/15|=?这题怎么算?
绝对值都是非负数,直接把式子调出
|1/11-1/12|+|1/12-1/13|+|1/13-1/14|+|1/14-1/15|
=1/11-1/12+1/12-1/13+1/13-1/14+1/14-1/15
=1/11-1/15
=4/165
1+10-11+12-1?
[170+1 /12] ×1 /13+11 /12
|1/11-1/12|+|1/12-1/13|+|1/13-1/14+|1/14-1/15|
1/11+1/12+1/13+1/14.+1/20
-1/(10*11)-1/(11*12)-...-1/(99*100)
1/10*11+1/11*12+...+1/19*20=?
1/10*11+1/11*12+.+1/59*60
1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于?
1/10×10+1/11×11+1/12×12+...+1/999×999+1/1000×1000
X-12\11 11=1:
[1-1/(11*11)]*[1-1/1(2*12)]...[1-1/(99*99)]
|1/11-1/10|+|1/12-1/11|+|1/13-1/12|-|1/13-1/10|=?
(1/10-1/11)+(1/11-1/12)+(1/12-1/13)+...(1/99-1/100)=?
有简便方法计算:|1/11-1/12|+|1/12-1/13|+|1/14-1/13|
(170+1/12)×1/13+11/12简便运算
9*10/1+10*11/1+11*12/1+12*13/1怎么算(简算)
-1/10*11-1/11*12-1/12*13-……-1/19*20
1/10*11+1/11*12+1/12*13+.+1/19*20如何简便计算