2007*(1-1/2)*(1-1/3)*(1-1/4).(1-1/2007)=?
1个回答
2007*(1-1/2)*(1-1/3)*(1-1/4).(1-1/2007)
=2007*(1/2*2/3*3/4*...*2006/2007)
=2007*1/2007
=1
相关问题
1/1*2+1/2*3+1/3*4+........+1/2007*2008
1/(1*2)+1/(2*3)+1/(3*4)+.1/(2007*2008)=
①1/2+1/2*3+1/3*4+…+1/2006*2007=
2010+2007*(1/3-1/2010)+3*(1/2007-1/2010)-2010*(1/2007+1/3) 用
(1-1/2008)+(2-1/2008*2)+(3-1/2008*3)+...+(2007-1/2008*2007)+
1×1—2×2+3×3—4*4+.+2007*2007
1+1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+……+1/(1+2+3+4+……+2007)
因式分解(1-1/2^)(1-1/3^)(1-1/4^)……(1-1/2007^)
2010+2007*(1/3-1/2010)+3*(1/2007-1/2010)-2010*(1/2007+1/3)的简
1/1*2*3+1/2*3*4.1/2005*2006*2007