limx->0,y->0(xy/(x^2+y^2))^2

limx->0,y->0(xy/(x^2+y^2))^2 limx趋近0,y趋近0 (x^2+y^2)^xy Limx→0y→0sin(xy)/y limx趋近于0y趋近于0sin(xy)/x求极限. 求解lim(y->5)(limx->2) 10/(x²+y²) 和lim(y->2)(limx->-1) (x²y+xy²)/(x+y)³ 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)) limx→2 y→0 ln(x+e*y)/根号(x*2+y*2) 求极限：1)x趋于0,y趋于1时,lim(1-xy)/(x^2+y^2)2)x、y趋于0时,lim1-cos根号（x^2+y^2)/（x^2+y^2);3)x、y趋于0时,limx/(x+y)2)题中的lim1-cos根号（x^2+y^2)是连在一起的最后才除以（x^2+y^2); limx^2*y/x^2+y^2 (x,y)趋近(0,0)如题 上面是X^乘以y limx趋近于0sin3x/2x limx趋向0 ln(cosx)/x^2 limx→1 x^2-x+1/x-1= limx→0+x^sinx= 证明limx趋近于0,y趋近于0x^3y/x^6+y^2不存在 证明limx趋近0y趋近0x+y/x-y不存在 limx→0(2+x／2-x)∧1/x limx-0(e^x+2^x-2)/x 求limx趋近0[ln(1+x)-x)/x^2] limx-0(1-3根号1-x+x^2)/x