Dr.Byeris____withtherenovationsmadetohisclinicbytheremodelingcompany
设三角区域D由直銭x+8y-56=0,x-6y+42=0与kx-y+8-6k=0(k<0)围成，则对任意的(x,y)，有㏒(x2+y2)≤2
(1)k∈(-∞,-1]
(2)k∈(-1,1/8]
Heisvery_____andwell-qualified,soheshouldreachthetopofthisprofession.
Allherhardwork__________intheend，andshefinallypassedtheexam．
证明方程xxx1nn-1+n1的整数，在区间1,12内有且仅有一个实根；(II)记(I)中的实根为xn，证明limnnx存在，并求此极限
