lim(x,y→2,0)sinxy/[√(xy+1-)1]
问题描述：
lim(x,y→2,0)sinxy/[√(xy+1-)1]
答
∵lim((x,y)->(2,0))[sin(xy)/(xy)] =lim(t->0)(sint/t) (令t=xy) =1 (应用重要极限) lim((x,y)->(2,0))[(xy)/(√(xy+1)-1)] =lim(...