|1/2-1|+|1/3-1/2|.|1/2012-1/2011|=?
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![|1/2-1|+|1/3-1/2|.|1/2012-1/2011|=?](/uploads/image/z/2451451-67-1.jpg?t=%7C1%2F2-1%7C%2B%7C1%2F3-1%2F2%7C.%7C1%2F2012-1%2F2011%7C%3D%3F)
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|1/2-1|+|1/3-1/2|.|1/2012-1/2011|=?
|1/2-1|+|1/3-1/2|.|1/2012-1/2011|=?
|1/2-1|+|1/3-1/2|.|1/2012-1/2011|=?
原式=1-1/2+1/2-1/3+1/3.+1/2011-1/2012 =1-1/2012 =2011/2012