Calculate: $$\dfrac{\dfrac{1}{1\times 2}+\dfrac{1}{3\times 4}+\dfrac{1}{5\times 6}+\cdots +\dfrac{1}{19\times 20}}{\dfrac{1}{11\times 20}+\dfrac{1}{12\times 19}+\dfrac{1}{13\times 18}+\cdots +\dfrac{1}{15\times 16}}=$$~\uline{~~~~~~~~~~}~． 
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