-1/10*11-1/11*12-1/12*13-……-1/19*20
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1+10-11+12-1?
-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
1/10×10+1/11×11+1/12×12+...+1/999×999+1/1000×1000
1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于?
9*10/1+10*11/1+11*12/1+12*13/1怎么算（简算）
1/9*10+1/10*11+1/11*12+1/12*13.1/100*101=
求|10/1-11/1|+|11/1-12/1|+.+|49/1-50/1|的值
|1/11-1/10|+|1/12-1/11|+……+|1/100-1/99|
求|1/10-1/11|+|1/11-1/12|+.+|1/49-1/50|的值
|1/10-1/11|+|1/11-1/12|+…|1/19-1/20|急
求|1/10-1/11|+|1/11-1/12|+…+|1/49-1/50|RT
求1/10-1/11+1/11-1/12+……+1/49-50--1/50
|1/11-1/10|+|1/12-1/11|+|1/13-1/12|-|1/13-1/10|=?
(9+10+11/8-10+11+12/9+11+12+13/10-12+13+14/11)/(1/8-1/9+1/10-1/11)=?
(1/8+1/9+1/+1/10+1/11)*(1/9+1/10+1/11+1/12)-(1/8+1/9+1/10+1/11+1/12)*(1/9+1/10+1/11)
计算,(1/8+1/9+1/10+1/11)x(1/9+1/10+1/11+1/12)-(1/8+1/9+1/10+1/11+1/12)x(1/9+1/10+1/11)