\frac{1.8}{(1.5-1.4)\times(1.3\div2.0-1.1\div1.7)\times(1.2-1.9\div1.6)}=489600
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  1. http://formula.s21g.com/?%5Cfrac%7B1.8%7D%7B(1.5-1.4)%5Ct...
  2. https://blog.watahari.com/2010/08/?m=0
  3. http://www.blogger.com/19917852/7262162144973512259