1,x^2-(k+2)x+4≥0判别式<=0(k+2)^2-16<=0(k+2)^2<=16-4<=k+2<=4-6<=k<=22,-x^2+3x>=0x^2-3x<=00<脊岩昌=x<樱扒=3 x-2>0x>22<枣饥x<=3