若|a-2|+(b-1)的平方=0 1/ab+1/(a+1)(b+1) + 1/(a+2)(b+2)+...+1/(a+2008)(b+2008)的值
来源:学生作业帮助网 编辑:六六作业网 时间:2025/01/23 23:14:59
若|a-2|+(b-1)的平方=0 1/ab+1/(a+1)(b+1) + 1/(a+2)(b+2)+...+1/(a+2008)(b+2008)的值
若|a-2|+(b-1)的平方=0 1/ab+1/(a+1)(b+1) + 1/(a+2)(b+2)+...+1/(a+2008)(b+2008)的值
若|a-2|+(b-1)的平方=0 1/ab+1/(a+1)(b+1) + 1/(a+2)(b+2)+...+1/(a+2008)(b+2008)的值
∵|a-2|+(b-1)²=0
∵|a-2|≥0
(b-1)²≥0
∴a-2=0 a=2
b-1=0 b=1
∵a-b=2-1=1
1/(1/2) = 1- 1/2
1/(2×3) = 1/2 - 1/3
1/(3*4)=1/3 -1/4
……
1/(2009×2010) = 1/2009 - 1/2010
若1/n﹙n+1﹚=1/n-﹙1/n+1﹚ [n≠0]
∴﹙1/ab﹚+1/(a+1)(b+1) + 1/(a+2)+...+1/(a+2008﹚(b+2008)
=½+1/﹙3×2﹚+1/﹙4×3﹚+………+1/﹙2009×2008﹚
=1-½+½-1/3+1/3-1/4+1/4………-1/2008+-1/2009+1/2009-1/2010
=1-1/2010
=2009/2010
若|a-2|+(b-1)的平方=0
a-2=0 a=2
b-1=0 b=1
1/(a+1)(b+1) + 1/(a+2)(b+2)+...+1/(a+2008)(b+2008)
=1/3*2+1/4*3+……+1/2010*2009
=1/2-1/3+1/3-1/4+……+1/2009-1/2010
=1/2-1/2010
=502/1005
你好!
∵|a-2|+(b-1)²=0
∴a-2=0 a=2
b-1=0 b=1
1/(1*2) = 1- 1/2
1/(2*3) = 1/2 - 1/3
1/(3*4)=1/3 -1/4
……
1/(2009*2010) = 1/2009 - 1/2010
∴原式= 1/(1*2) + 1/(2*3) +……+1/(2009*2010)
= 1-1/2+1/2-1/3+……+1/2009-1/2010
=1 - 1/2010
= 2009/2010
不知道