lim_(x arrow + infty)(x^2+y^2)sin (3)/(x^2)+y^(2)

lim _(x arrow 2) (sin xy)/(y) = ( )A. $\infty$B. 0C. 1D. 2

lim_(x arrow infty ) (2x^3-x+1)$ \lim_{x \rightarrow \infty } (2x^3-x+1) $

7.试求下列极限:-|||-(1) lim _((x,y)arrow +infty )dfrac ({x)^2+(y)^2}({x)^4+(y)^4}-|||-

lim _(x arrow 1) (x-y)/(x^2)-y^(2)=A. 0 ;B. $\frac{1}{2}$ ;C. $\infty$ ;D. 不存在.

lim_(x arrow 1) (sin^2(x-1))/(x^2)-1$\lim_{x \rightarrow 1} \frac{\sin^{2}(x-1)}

lim_(x arrow infty ) ((1+x)/(x))^2x$\lim_{x \rightarrow \infty } (\frac{1+x}{x})

极限 lim_((x,y)to (0,0)) (x^2 y)/(x^4 + y^2) = ( )A. 等于 0；B. 不存在；C. 等于 $\frac{1}{2

极限 lim_((x,y)to (0,0)) (x^2y)/(x^4 + y^2) ().A. 等于0B. 不存在C. 等于2D. 存在但不等于0

试求下列极限(包括非正常极限):-|||-(1) lim _((x,y))(dfrac ({x)^2(y)^2}({x)^2+(y)^2}-|||-(2) li

13、二重极限lim_((x,y)to(1,0))(sqrt(x^2)+y^(2)-x)/(y^2)=____.13、二重极限$\lim_{(x,y)\to(1