关于分式的加减.已知:1/x(x+1)=(1/x - 1/x+1)*1,1/x(x+2)=(1/x - 1/x+2)*1
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关于分式的加减.
已知:1/x(x+1)=(1/x - 1/x+1)*1,
1/x(x+2)=(1/x - 1/x+2)*1/2,
1/x(x+3)=(1/x - 1/x+3)*1/3,
…………
1/x(x+10)=(1/x - 1/x+10)*1/10
则:1/(x+m)(x+n)=_________________;
探究:若|ab-2|+(b-1)²=0,试求1/ab + 1/(a+1)(b+1) + 1/(a+2)(b+2) + 1/(a+3)(b+3) +……+ 1/(a+2007)(b+2007) + 1/(a+2008)(b+2008) 的值.
已知:1/x(x+1)=(1/x - 1/x+1)*1,
1/x(x+2)=(1/x - 1/x+2)*1/2,
1/x(x+3)=(1/x - 1/x+3)*1/3,
…………
1/x(x+10)=(1/x - 1/x+10)*1/10
则:1/(x+m)(x+n)=_________________;
探究:若|ab-2|+(b-1)²=0,试求1/ab + 1/(a+1)(b+1) + 1/(a+2)(b+2) + 1/(a+3)(b+3) +……+ 1/(a+2007)(b+2007) + 1/(a+2008)(b+2008) 的值.
1/(x+m)(x+n)=[1/(x+m)-1/(x+n)]*1/(n-m)
|ab-2|+(b-1)²=0
ab-2=0,b-1=0
b=1
a=2
1/ab + 1/(a+1)(b+1) + 1/(a+2)(b+2) + 1/(a+3)(b+3) +……+ 1/(a+2007)(b+2007) + 1/(a+2008)(b+2008)
=1/2+1/6+1/12+1/20+……+1/2009*2010
=1-1/2+1/2-1/3+1/3-1/4+……+1/2009-1/2010
=1-1/2010
=2009/2010
|ab-2|+(b-1)²=0
ab-2=0,b-1=0
b=1
a=2
1/ab + 1/(a+1)(b+1) + 1/(a+2)(b+2) + 1/(a+3)(b+3) +……+ 1/(a+2007)(b+2007) + 1/(a+2008)(b+2008)
=1/2+1/6+1/12+1/20+……+1/2009*2010
=1-1/2+1/2-1/3+1/3-1/4+……+1/2009-1/2010
=1-1/2010
=2009/2010
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