1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+.+1/(a+2008)(b+2008)=
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1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+.+1/(a+2008)(b+2008)=
ab=2 b=1 a=2
ab=2 b=1 a=2
a=2
b=1
1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+.1/(a+2008)(b+2008)
=1/1*2+1/2*3+1/3*4+……+1/2009*2010
=1-1/2+1/2-1/3+1/3-1/4+1/4-……-1/2009+1/2009-1/2010
=1-1/2010
=2009/2010
b=1
1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+.1/(a+2008)(b+2008)
=1/1*2+1/2*3+1/3*4+……+1/2009*2010
=1-1/2+1/2-1/3+1/3-1/4+1/4-……-1/2009+1/2009-1/2010
=1-1/2010
=2009/2010
a(a-1)-(a×a-b)=-5,求(a×a+b×b)÷2-ab
已知a+b=A ab=A+2008 1-2(a+ab)+(ab-2b)=3A 求a+b ab的值
已知a+b=A,ab=A+2008,1-2(a+ab)+(ab-2b)=3A.求a+b和ab的值
计算ab/(a+b-1)(a+b)+ab/(a+b)(a+b+1)+ab/(a+b+1)(a+b+2)+.+ab/(a+
求证:A/(AB+B^2)-B/(AB+A^2)=1/B-1/A
如果a+b=3,ab=-1,那么(a+b)2-a-b+ab=?
先化简,再求值:[a/(a+b)-b/(b-a)-2ab/(a^2-b^2)]/(1/a-1/b),其中a+b=3,ab
把B=A^2/(A+1)代入【(B-A)/AB】[1-(A-B)]求值.
1.已知A-B=-根号2 AB=1/3求代数式 (A-B)+A*A+B*B+AB
ab+a+b+1
急……ab/(a+b-1)(a+b) + ab/(a+b)(a+b+1) + ab(a+b+1)(a+b+2) + ……
已知(3a-b+1)的绝对值+(3a-b/2)^2=0求b^2/a+b除以(b/a+b*ab/a+b)的值