作业帮1/2*4+1/4*6+1/6*8+····+1/2006*2008=几
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1/2*4+1/4*6+1/6*8+····+1/2006*2008=几
1/2*4+1/4*6+1/6*8+····+1/2006*2008=几
1/2*4+1/4*6+1/6*8+····+1/2006*2008=几
1/2*4+1/4*6+1/6*8+····+1/2006*2008
=(1/2-1/4+1/4-1/6+1/6-1/8+……+1/2006-1/2008）/2
=（1/2-1/2008）/2
=1003/4016
1/2n(2n+2)=1/2[1/2n-1/(2n+2)]
1/2*4+1/4*6+1/6*8+····+1/2006*2008
=1/2(1/2-1/4+1/4-1/6+1/6-1/8+----+1/2006-1/2008)
=1/2(1/2-1/2008)
=1003/4016
计算1/2×4+1/4×6+1/6×8+···+1/2006×2008
计算：(2+4+6+8+···+100)-(1+3+5+···+99)
1/（2*4）+1/（4*6）+1/（6*8）+········+1/（2006*2008）等于?
1/2*4+1/4*6+1/6*8+····+1/2006*2008=几
1/2*4+1/4*6+1/6*8+····+1/2006*2008=几
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把1 9填入81格方框,不能重复· · 4 · · 5 · 6 ·9 · · 3 · · · 5 17 · · 6 · · · · 3· · 9 · 1 6 · 4 ·· 2 · 4 · · · 8 ·· 4 · 7 · · 5 · ·5 · · · · 7 · · 84 1 · · · 8 · · 5· 8 · 9 · · 6 · 4
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