解集为{x|X<-3或X>-2}.
可知k<0
由韦达定理可得：
2/k=-2+(-3)
2/k=-5
k=-2/5
k<0,
△>0
(-2)^2-4k*6k>0
1-6k^2>0
6k^2<1
-√6/6
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