1/(2*5)+1/(5*8)+1/(8*11)+.+1/(2006*2009)+1/(2009*2012)怎么做?
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1/(2*5)+1/(5*8)+1/(8*11)+.+1/(2006*2009)+1/(2009*2012)怎么做?1/(2*5)+1/(5*8)+1/(8*11)+.+1/(2006*2009)+1
1/(2*5)+1/(5*8)+1/(8*11)+.+1/(2006*2009)+1/(2009*2012)怎么做?
1/(2*5)+1/(5*8)+1/(8*11)+.+1/(2006*2009)+1/(2009*2012)怎么做?
1/(2*5)+1/(5*8)+1/(8*11)+.+1/(2006*2009)+1/(2009*2012)怎么做?
原式=1/3(1/2-1/5+1/5-1/8+...+1/2009-1/2012)
= 1/3(1/2-1/2012)
=335/2012
=(3/(2*5)+3/(5*8)+3/(8*11)+......+3/(2006*2009)+3/(2009*2012))/3
=(1/2-1/5+1/5-1/8+1/8-1/11+...+1/2006-1/2009+1/2009-1/2012)/3
=(1/2-1/2012)/3
=(1006-1)/2012/3
=335/2012
1/2,1,7/8,5/8,13/32,()
1 1 2 3 5 8 () () ()
1,1,2,3,5,8,(),(),34,()
1+24×(5^2+1)(5^4+1)(5^8+1)怎么算?
4/5+(3/8-1/2)
1,1,2,3,5,8,( ),21,( ),55.
1,-1,-2,3,-5,-8,13,( ),( )
(1).3 1/8*(3 1/8-8 1/8)*8/25*(-24/25) 是3又8分之一.(2).(5 1/2-2 1/3-1 5/6)*(-18)-(-2)*(+87.5)*(-5)
1/2,1/3,2/5,3/8,5/13,8/21(),()找规律
1/4,2/7,2/5,8/13,1()
找规律填空 5,8,11,15( ) 1,1,2,3,5,8( ),21
找规律1,2,3,5,8,()()7,8,6,7,5,()()
(1/8+2/8+3/8)+(1/5+1/7)-(1/5乘1/7)乘(35除以7乘5)=
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找规律 1、1、2、3、5、8、()21.
1,1,2,3,5,8,(),21,34
1 2 5 8=1(填符号)
1 1 2 3 5 8 () 21,括号里是几?