x,y->(0,0) lim (√(4+xy)-2)/√xy√w为根号~

lim sin(y×x^2+y^4)/(x^2+y^2) x,y都趋于0， 1.lim(2x-sinx)/(2x+sinx) (x→0)2.lim(sinsinx)/x (x→0)3.lim 4/y (y→∞) Lim(x²y/x^4+y²) (x,y)趋向于(0,0) lim((x^2)y)/(x^4+y^2),x和y都趋向于0 求极限. lim (x→0) [√ (xy+4) -2 ]/xy (y→0)lim (x→0)(y→0)[√ (xy+4) -2 ]/xy 求下列极限 1.lim x→0y→2 sin(xy)/x 2.lim x→0y→0 (2-√（xy+4）)/xy3.lim x→0y→0(x^2y)/(x^3-y^3) 4.limx→0y→1 xy*sin(1/(x^2+y^2)) x,y->(0,0) lim (√(4+xy)-2)/√xy√w为根号~ lim[2-√(xy+4)]/xy x趋向于0 y趋向于0 求极限lim (sinxy) / y x->a y->0 1、lim(x->无穷大) e^x arctanx2、lim(x->0)sinx√1+sin(1/x)3、lim(x->无穷大)【（√x^2+x+1）-【(√x^2-x+1)】4、lim(x->无穷大)((x+{x+(x)^0.5]^0.5}^0.5)/(2x+1)^0.55、lim(x->0)(sin3x+x^2sin1/x)/((1+cosx)x)6、lim(n->无穷大)(2^n)(si lim(x,y)→(0,0) (1+xcosy)^(1/x) lim(x,y)->(0,2)(1-3xy)^2/x 二元函数f(x,y)在点(0,0)处可微的一个充分条件是A.lim【f(x,y)-f(0,0)】=0 (x,y)→(0,0)B.lim{【f(x,0)-f(0,0)】/x}=0 (x→0),且 lim{【f(0,y)-f(0,0)】/y}=0 (y→0)C.lim{【f(x,y)-f(0,0)】/√（x^2+y^2) }=0 (x,y)→(0,0)D.lim【f&# 讨论极限lim（x→0 y→0） [（X^2）y]/[(x^4)+(y^2)]: 重赏求极限lim(x^2*|y|^3)/2/(x^4+y^2),x→0y→0 求解个高数题lim ㏑(y＋e^x)/根号（x^4+y^2）x趋于0，y趋于1 求一个二元函数的极限lim((x^2)y+x^5)/(x^4+x^6+2(x^3)y+y^2))(x,y)->(0,0)谢谢 跪求极限Y=lim (xy+1)/x^4+y^4,当（x,y）→（0,0）,