求下列各极限:(1) lim_((x,y)to(0,1))(1-xy)/(x^2)+y^(2);(3) lim_((x,y)to(0,0))(2-sqrt(xy+4))/(xy);(5) lim_((x,y)to(2,0))(tan(xy))/(y);

6. 求下列各极限: (1) $\lim_{(x,y)\to(0,1)}\frac{1-xy}{x^{2}+y^{2}};$ (3) $\lim_{(x,y)\to(0,0)}\frac{2-\sqrt{xy+4}}{xy};$ (5) $\lim_{(x,y)\to(2,0)}\frac{\tan(xy)}{y};$

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