计算  $2\frac{1}{19}\times \frac{2}{3}-\frac{7}{19}$的值为（    ）

阅读理解

    I'm Li Ming．The holidays always make me happy．Last summer holiday,I went to Paris with my mother by plane．We went there to visit my uncle．He met us at the airport．

    My uncle took us to visit the Louvre Museum by underground．I saw a lot of famous things．I enjoyed many old pictures in it．The pictures were very creative(有创意的)．We also visited the Eiffel Tower．It is the famous symbol(标志)of Paris．One evening，my uncle took us to eat good food and go shopping．My mother bought many clothes-some for her,and some for my sister．

We stayed in Paris for about half a month.The trip gave me lots of fun.I will remember it.

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在今天的信息时代背景下，我们怎样才能适应社会的发展要求？

计算：$\sqrt{27}\times \sqrt{50}÷\sqrt{6}$