作业帮1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3 )+……+1/(a+2009)(a+2010)
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/13 11:44:15
1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3 )+……+1/(a+2009)(a+2010)
1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3 )+……+1/(a+2009)(a+2010)
1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3 )+……+1/(a+2009)(a+2010)
1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3 )+……+1/(a+2009)(a+2010)
=1/a-1/(a+1)+1/(a+1)-1/(a+2)+1/(a+2)-1/(a+3 )+……+1/(a+2009)-1/(a+2010)
=1/a-1/(a+2010)
=2010/[a(a+2010)]
令10^x=a
x=lga
所以f(a)=lga-2
f(x)=lgx-2
1000x-383.5/x=4.7
1000x^2-4.7x-383.5=0
求根公式
x=(47±√153402209)/20000
f(x+1)=lg(x+1)-2
f(2)=lg2-2
(a 1)(a 2)(a 3)(a
(a+2)(a+1)-a(a-3)
a-1/a+2
1-a/-2-a
-2×a×1/a
计算：[a-(1/a)]/a^2-2a+1/a
a(a-1)(a-2)(a-3)(a-4)因式分解
【1】a+a=a×a a= [ ]【2】a×a=a÷a a=[ ]【3】a×a=a－a a=[ ] [4]a－a=a＋a a=[ ]
(通分） a/a^a^a+3a+2 ,a/a^a+2a+1 ,-1/3a+6
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a+a+1+a+2+a+3+a+4+a+5+a+6+a+7.+a+2013+a+2014=?
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a*a*a*a+a*a+1/a*a+a+1 化简
1+a+a(1+a)+a(1+a)^2+...+a(1+a)^n