1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)……1/(a+2005)(b+2005)=?a=2,b=1
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1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)……1/(a+2005)(b+2005)=?a=2,b=11/ab+1/(a+1)(b+1)+1/(a+2)(b+2)……1/(a+2005
1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)……1/(a+2005)(b+2005)=?a=2,b=1
1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)……1/(a+2005)(b+2005)=?
a=2,b=1
1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)……1/(a+2005)(b+2005)=?a=2,b=1
=1/(2*1)+1/(3*2)+1/(4*3)……1/(2007*2006)
=1-1/2+1/2-1/3+1/3-1/4……1/2006-1/2007
=1-1/2007
=2006/2007
ab+a+b+1
ab-a-b+1
a²+ab/a²-ab·1/a+b·b²-ab/ab 计算
(a+b-2ab)(a+b-2)+(1-ab)^2
1+a+ab+b=?
因式分解1-a-b+ab
因式分解 ab-a+b-1
ab+a+b+1 因式分解
(ab+a)+(b+1) 因式分解
因式分解 ab-a-b+1
ab+a+b+1 因式分解
因式分解:ab-a+b+1
ab-a-b+1因式分解,
ab+a+b+1因式分解
(ab+a)+(b-1)因式分解
因式分解(ab+1)平方+(ab+1)(a+b)+ab步骤
(a+b)(a²-ab+b²)-b(b-1)
急……ab/(a+b-1)(a+b) + ab/(a+b)(a+b+1) + ab(a+b+1)(a+b+2) + …… + ab/(a+b+98)(a+b+99) + ab/(a+b+99)(a+b+100)