作业帮1/ab+1/(a-1)(b-1)+1/(a-2)(b-2)+…+1/(a-2011)(b-2011)的值.(a=-2,b=-1)
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1/ab+1/(a-1)(b-1)+1/(a-2)(b-2)+…+1/(a-2011)(b-2011)的值.(a=-2,b=-1)
1/ab+1/(a-1)(b-1)+1/(a-2)(b-2)+…+1/(a-2011)(b-2011)的值.(a=-2,b=-1)
1/ab+1/(a-1)(b-1)+1/(a-2)(b-2)+…+1/(a-2011)(b-2011)的值.(a=-2,b=-1)
当a=-2,b=-1时
1/ab+1/(a-1)(b-1)+1/(a-2)(b-2)+……+1/(a-2011)(b-2011)
=1/[-2×(-1)]+1/[-3×(-2)]+1/[-4×(-3)]+……+1/[-2013×(-2012)]
=1/(1×2)+1/(2×3)+1/(3×4)+……+1/(2012×2013)
=1-1/2+1/2-1/3+1/3-1/4+……+1/2012-1/2013
=1-1/2013
=2012/2013
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)