Question

极限lim(x2-x+k)/x-3 存在并且为a求k和a的值

Answer 1

x=3

分子=0

9-3+k=0

k=-6

lim(x->3)(x2-x-6)/(x-3)

=lim(x->3)(x+2)(x-3)/(x-3)

=lim(x->3)(x+2)

=5

=a

即

a=5,k=-6