作业帮1/(1×5)+1/(5×10)+1/(10×15)+···+1/(2005×2010)=
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1/(1×5)+1/(5×10)+1/(10×15)+···+1/(2005×2010)=
1/(1×5)+1/(5×10)+1/(10×15)+···+1/(2005×2010)=
1/(1×5)+1/(5×10)+1/(10×15)+···+1/(2005×2010)=
1/(1×5)+1/(5×10)+1/(10×15)+···+1/(2005×2010)
=1/5+1/5×﹙1/5-1/10+1/10-1/15+1/15-1/20+……+1/2005-1/2010)
=1/5×﹙1+1/5-1/2010)
=1/5×2412/2010
=1402/1675
1 2 5 10
1/3+1/6+1/10+1/5+.+1/5050
1/3+1/6+1/10+1/5+.+1/5050
（1+1/2)*(1+1/4)*.*(1+1/10)*(1-1/3)*(1-1/5)*.(1-1/9)简算
((1/2)-1)*((1/3)-1)*((1/4)-1)*((1/5)-1)*((1/6)-1)*((1/7)-1)*((1/8)-1)*((1/9)-1)*((1/10)-1)
/1/3-1/2/+/1/4-1/3/+/1/5-1/4/+.+/1/10-1/9/
|1/3-1/2|+|1/4-1/3|+|1/5-1/4|+...+|1/10-1/9|
1/5+1/10+1/20+...+1/160
1/5,1/10,1/17,1/26,（）
1/5+1/10+1/20+1/40=?用巧算
1/(1×5)+1/(5×10)+1/(10×15)+···+1/(2005×2010)=
简算:1/8×5+5/8×5+1/8×10
1,1,5,10怎么等于24
1/5x-1/10=2
3/10+1/5-1/3计算,
(1/5X+1/10Y)^2
(-1/5x+1/10y)^2
10÷[1/5×(35%-1/10)×4/5]求简算