1/4+1/(4+6)+1/(4+6+8)+.../(2+4+6+...+2n)的极限怎样求
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1/4+1/(4+6)+1/(4+6+8)+.../(2+4+6+...+2n)的极限怎样求1/4+1/(4+6)+1/(4+6+8)+.../(2+4+6+...+2n)的极限怎样求1/4+1/(4
1/4+1/(4+6)+1/(4+6+8)+.../(2+4+6+...+2n)的极限怎样求
1/4+1/(4+6)+1/(4+6+8)+.../(2+4+6+...+2n)的极限怎样求
1/4+1/(4+6)+1/(4+6+8)+.../(2+4+6+...+2n)的极限怎样求
分母有通项是:2+4+6+...+2n=n(n+1)
所以通项是:1/n(n+1)=1/n-1/(n+1)
所以:1/2+1/(2+4)+1/(2+4+6)+1/(2+4+6+8)+...+!/(2+4+6+...+2n)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.+1/(n-1)-1/n+1/n-1/(n+1)
=1-1/(n+1)
所以当n趋向无穷大时,该式极限是1
1+6+6+8+4+2+6+6+5+4+4+1+4+7+45
[2^4+1/4)(4^4+1/4)(6^4+1/4)(8^4+1/4)(10^4+1/4)】/[1^4+1/4)(3^4+1/4)(5^4+1/4)(7^4+1/4)(9^4+1/4)]
|1/4-1/2|+|1/6-1/4|+|1/8-1/6|+```+|1/2008-1/2006|
1/2+1/4+1/6+1/8+.1/n
1/2*4+1/4*6+1/6*8+1/8*10+---+1/198*200
1+1/2+4+1/2+4+6+1/2+4+6+8+.+1/2+4+6+8...+20
1/2*4*6+1/4*6*8+1/6*8*10+.+96*98*100
1/2*4+1/4*6+1/6*8+.+1/2006*2008=(1/2*4)+(1/4*6)+(1/6*8)+..........+(1/2006*2008)
1/2*4+1/4*6+1/6*8+1/8*10.1/2006*2008
计算1/2*4+1/4*6+1/6*8+.+1/2002*2004+1/2004*2006
1+1+4+6+4+3+8+50+1000+556
2/1+4/1+4/1+6/1+8/1+16/1+32/1=?
10,1,8,1,6,2,4,6,2,().
(8/9-5/6-1/4)*(-36)
8、6、4、1 24点
1+4+5+6+8=
1 ,4,6,8怎么等于24?
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