1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2012)(b+2012)=?快又好送分!
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1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2012)(b+2012)=?快又好送分!1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a
1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2012)(b+2012)=?快又好送分!
1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2012)(b+2012)=?
快又好送分!
1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2012)(b+2012)=?快又好送分!
a=1 b=2
1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2012)(b+2012)
=1/1x2+1/2x3+1/3x4+……+1/2003x2004
=1-1/2+1/2-1/3+1/3-1/4+……+1/2003-1/2004
=1-1/2004
=2003/2004
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)