展开,移项,合并同类项得-10/3x=-k+4解得x=-3/10k+6/51.正数当x>0时,-3/10k+6/5>0,k<42.负数当x<0时,-3/10k+6/5<0,k>43.零当x=0时,-3/10k+6/5=0,k=4O(∩_∩)O