①|3k-2+3|÷√(1+k^2)=2
解得k=-3/5±2√6/5
即k最大值-3/5+2√6/5,最小值为-3/5-2√6/5
②3k-2+3|÷√(1+k^2)≥√[2^2-(2√3÷2)^2]
k≥0或k≤-3/4
(图片发不上去!)