题目

                In the US, people prefer waiting for a table to sitting with people they don’t know. If you are sitting at a table with people you don’t know, it is impolite to smoke without first asking if it will disturb them. In American restaurants and coffee shops you are usually served tap water(自来水) before you order. You may find the bread and butter is free, and if you order coffee, you may get a free refill(补充).                 Serving(食物) in restaurants are often too large for many people. If you can’t finish your meal but wo13．化简：（1）$\frac{1}{3}$$\sqrt{{x}^{2}y}$•（-4$\sqrt{\frac{{y}^{2}}{x}}$）$÷\frac{1}{6}$$\sqrt{{x}^{2}y}$；（2）$\sqrt{3}$$÷\sqrt{2}$×$\frac{14}{\sqrt{3}-\sqrt{2}}$-（$\sqrt{24}$$+\sqrt{12}$）