丨1/2-1丨十丨1/3-1/2丨十丨1/4-1/3丨十.丨1/2014-1/2013丨
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![丨1/2-1丨十丨1/3-1/2丨十丨1/4-1/3丨十.丨1/2014-1/2013丨](/uploads/image/z/7044577-25-7.jpg?t=%E4%B8%A81%2F2-1%E4%B8%A8%E5%8D%81%E4%B8%A81%2F3-1%2F2%E4%B8%A8%E5%8D%81%E4%B8%A81%2F4-1%2F3%E4%B8%A8%E5%8D%81.%E4%B8%A81%2F2014-1%2F2013%E4%B8%A8)
丨1/2-1丨十丨1/3-1/2丨十丨1/4-1/3丨十.丨1/2014-1/2013丨
丨1/2-1丨十丨1/3-1/2丨十丨1/4-1/3丨十.丨1/2014-1/2013丨
丨1/2-1丨十丨1/3-1/2丨十丨1/4-1/3丨十.丨1/2014-1/2013丨
绝对值里都是负数,去绝对值时添负号 最后等于1-1/2014=2013/2014