1/(2×4)+1/(4×6)+1/(6×8)+1/(8×10)+···+1/(2006×2008)
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-1/2+(-1/6)-(-1/4)-2/3
(2/1-4/1)+(4/1-6/1)+(6/1-8/1)+.+(48/1-50/1)
10,1,8,1,6,2,4,6,2,().
(1/2+1/3+1/4+1/6)*24
-72×(1/4+1/6+1/2)
计算:-72×(1/4+1/6-1/2)
(1/4+1/6-1/2)×12
(1/4+1/6-1/2)×12
求和:1+(1+2)+(1+2+4)+(1+2+4+6)+(1+2+4+.2^n-1)
1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),
1/2-(3/4-3/8), 1/2+1/4-1/6 , 2/3+(1/2+1/4),1/2-(3/4-3/8), 1/2+1/4-1/6 , 2/3+(1/2+1/4),
1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),
1/(2*4)+1/(4*6)+1/(6*8)+.+1/(2008*2010)
1 3/4-5/6-(+1 1/6)-(-1/2)
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
1/2+1/(2+4)+1/(2+4+6)+...1/(2+4+6+...2n),求和
1/(2+4)+1/(4+6)+1/(6+8)+…1/(2010+2012)怎么做
探究并计算:1/(2*4)+1/(4*6)+1/(6*8)+…+1/(2006*2008)