初一数学|1/2007-1/2006|-|1/2008-1/2006|+|1/2008-1/2007|

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初一数学|1/2007-1/2006|-|1/2008-1/2006|+|1/2008-1/2007|
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初一数学|1/2007-1/2006|-|1/2008-1/2006|+|1/2008-1/2007|
初一数学|1/2007-1/2006|-|1/2008-1/2006|+|1/2008-1/2007|

初一数学|1/2007-1/2006|-|1/2008-1/2006|+|1/2008-1/2007|
|1/2007-1/2006|-|1/2008-1/2006|+|1/2008-1/2007|
=-1/2007 + 1/2006 + 1/2008 - 1/2006 - 1/2008 + 1/2007
=0

真难

=(1/2006-1/2007)-(1/2006-1/2008)+(1/2007-1/2008)
=1/2006-1/2007-1/2006+1/2008+1/2007-1/2008
=0

0 理解绝对值和数字加减法 绝对值=正数 加油啊 学数学联系实际 要有想象力

因为2007>2006,所以 1/2007<1/2006 .同理,1/2008<1/2006 ,1/2008<1/2007 .
|1/2007-1/2006|-|1/2008-1/2006|+|1/2008-1/2007|
=(1/2006-1/2007)-(1/2006-1/2008)+(1/2007-1/2008)
=1/2006-1/2007-1/2006+1/2008+1/2007-1/2008
=0

=(﹣1/2007+1/2006)-(﹣1/2008+1/2006)+(﹣1/2008+1/2007)
=0
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