作业帮(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/5+1/10+1/15+1/20）怎么解?
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(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/5+1/10+1/15+1/20）怎么解?
(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/5+1/10+1/15+1/20）怎么解?
(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/5+1/10+1/15+1/20）怎么解?
(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/5+1/10+1/15+1/20）
=1/2×(1+1/2+1/3+1/4)-1/3×(1+1/2+1/3+1/4)+1/4×(1+1/2+1/3+1/4)-1/5×(1+1/2+1/3+1/4)
=（1/2-1/3+1/4-1/5）×(1+1/2+1/3+1/4)
=13/60×29/12
=377/720
1/2+1/4+1/6+1/8+.1/n
|1/4-1/2|+|1/6-1/4|+|1/8-1/6|+```+|1/2008-1/2006|
((1/2)-1)*((1/3)-1)*((1/4)-1)*((1/5)-1)*((1/6)-1)*((1/7)-1)*((1/8)-1)*((1/9)-1)*((1/10)-1)
1+1+1+1+1+1+1+1+1+2+5+4+8+3+6+2+1+4等于多少?
2/1+4/1+4/1+6/1+8/1+16/1+32/1=?
9*(1-1/2)*(1-1/3)*(1-1/4)*(1-1/5)*(1-1/6)*(1-1/7)*(1-1/8)*(1-1/9)怎样简便计算
1/2*4+1/4*6+1/6*8+1/8*10+---+1/198*200
4,2,1,1/2,1/4,（ ) ( ) ( )1/8,1/32,1/4 ,1/16( )( ) ( )1/2,1/6,1/12,1/20,1/30,1/42 ( ) ( ) ( )
2/1 3/1 4/1 5/1 6/1 8/1 10/1 12/1 15/1 20/1
1/4-1/2+1/6-1/4+1/8-1/6+...+1/2008-1/2006计算题计算题1/4-1/2+1/6-1/4+1/8-1/6+...+1/2008-1/2006
求证：1+1/2+1/3+1/4+1/8+1/6+1/7+^+1/(2n-1)>n/2
1+1+2+1+2+6+4+5+8等于
计算:|4/1-2/1|+|6/1-4/1|+|8/1-6/1|+.+|2008/1-2006/1|
计算 ｜1/4-1/2｜+｜1/6-1/4｜+｜1/8—1/6｜+.+｜1/2008-1/2006｜
|1/4-1/2|+|1/6-1/4|+|1/8-1/6|+……+|1/2008-1/2006|是多少
（2/1-4/1）+（4/1-6/1）+（6/1-8/1）+.+（48/1-50/1）
计算:|1/4-1/2|+|1/6-1/4|+|1/8-1/6|+…+|1/2008-1/2006|1003/2008
求|1/4-1/2|+|1/6-1/4|+|1/8-1/6|+.+|1/100-1/98|的值