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1/2X4+1/4X6+1/6X8+1/8X10+1/10X12=

1/2X4+1/4X6+1/6X8+1/8X10+1/10X12==(1/2-1/4+1/4-1/6...

1/2×4+1/4×8+1/6×8+...+1/2012×2014 =1/2×(1/2-1/4)+...

解: 1/(2×4)+ 1/(4×6)+ 1/(6×8)+...+1/(2010×2012) =...

1/2x4+1/4x6+1/6x8+.....+1/2010x2012 =1/2[(1/2-1/4...

2/2x4十2/4x6十2/6x8十2/8x10十2/10x12=1-2/4+2/4-2/6+2/6...

解:1/2x4+1/4x6+1/6x8+...+1/2006x2008 =1/2*1/2(1/1*...

先把1/4提出来 原题就是1/1*2+1/2*3+1/3*4+...+1/24*25 a1=1/...

1/2×4+1/4x6+1/6x8+.......1/98x100 =1/2×(1/2-1/4+1...

1/2x4+1/4x6+1/6x8+...+1/18x20 =(1/2-1/4+1/4-1/6+1...

您好,寒樱暖暖为你解答: 原式=2×(1/2-1/4+1/4-1/6+1/6-1/8+1/2014...

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