limx^2*y/x^2+y^2 (x,y)趋近(0,0)如题 上面是X^乘以y

limx->0,y->0(xy/(x^2+y^2))^2 计算limx^2y/x^2+y^2,x趋向于0.y趋向于1~ limx→2 y→0 ln(x+e*y)/根号(x*2+y*2) 求解lim(y->5)(limx->2) 10/(x²+y²) 和lim(y->2)(limx->-1) (x²y+xy²)/(x+y)³ 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0,y趋近0 (x^2+y^2)^xy 证明limx趋近于0,y趋近于0x^3y/x^6+y^2不存在 x趋向于无穷大,则limx^2sin^2(y/x)是多少? limx趋向无穷大 2^x 求微分方程y'=x^2/(1+y^2) 和极限 limx->∞(√(x^2+3x)-√(x^2+1)) 要求解过程谢谢 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 limx^2+y^2）sin（1／x^2+y^2）的极限.x,y都是趋向于0的 化简y(x+y)+(x+y)(x-y)-x^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(√(1+x^2)-x) (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 因式分解x(x+y)(x-y)-x(x+y)^2