作业帮1/2*4+1/4*6+1/6*8+1/8*10+1/10*12+1/12*14+1/14*16
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1/2*4+1/4*6+1/6*8+1/8*10+1/10*12+1/12*14+1/14*16
1/2*4+1/4*6+1/6*8+1/8*10+1/10*12+1/12*14+1/14*16
1/2*4+1/4*6+1/6*8+1/8*10+1/10*12+1/12*14+1/14*16
1/2*4+1/4*6+1/6*8+1/8*10+1/10*12+1/12*14+1/14*16
=(1/2)*(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10+1/10-1/12+1/12-1/14+1/14-1/16)
=(1/2)*(1/2-1/16)
=7/32
1/n(n+2)=(1/n-1/(n+2))/2
所以:1/2*4+1/4*6+1/6*8+1/8*10+1/10*12+1/12*14+1/14*16
=(1/2-1/16)/2=7/32
|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+6+6+8+4+2+6+6+5+4+4+1+4+7+45
1/2*4+1/4*6+1/6*8+.+1/2006*2008=(1/2*4)+(1/4*6)+(1/6*8)+..........+(1/2006*2008)
10,1,8,1,6,2,4,6,2,（）.
2/1+4/1+4/1+6/1+8/1+16/1+32/1=?
计算1/2*4+1/4*6+1/6*8+.+1/2002*2004+1/2004*2006
1/2*4*6+1/4*6*8+1/6*8*10+.+96*98*100
1/2*4+1/4*6+1/6*8+1/8*10.1/2006*2008
1+1+2+1+2+6+4+5+8等于
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
1+1+1+1+1+1+1+1+1+2+5+4+8+3+6+2+1+4等于多少?
1,2,4,6,
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