化简:x(x+1)分之1+(x+1)(x+2)分之1+(x+2)(x+3)分之1+.+(x+2006)(x+2007)分之1

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/14 19:14:22

化简:x(x+1)分之1+(x+1)(x+2)分之1+(x+2)(x+3)分之1+.+(x+2006)(x+2007)分之1
化简:x(x+1)分之1+(x+1)(x+2)分之1+(x+2)(x+3)分之1+.+(x+2006)(x+2007)分之1

化简:x(x+1)分之1+(x+1)(x+2)分之1+(x+2)(x+3)分之1+.+(x+2006)(x+2007)分之1
1/x(x+1)=1/x-1/(x+1)
1/(x+1)(x+2)=1/(x+1)-1/(x+2)
.
1/(x+2006)(x+2007)=1/(x+2006)-1/(x+2007)
x(x+1)分之1+(x+1)(x+2)分之1+(x+2)(x+3)分之1+.+(x+2006)(x+2007)分之1
=1/x-1/(x+1)+1/(x+1)-1/(x+2)+.+1/(x+2006)-1/(x+2007)
=1/x-1/(x+2007)
=2007/x(x+2007)

原式=
1/x-1/(1+X)+1/(1+x)-1/(x+2)……-1/(x+2006)+1/(x+2006)-1/(x+2007)
=1/x-1/(x+2007)

原式=1/x-1/(x+1)+1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3)+....+1/(x+2006)-1/(x+2007)
=1/x-1/(x+2007)

2005