解下列不等式.(1)X2-7+12>0(2)-x2-2x+3≥0(3)x2-2x+1<0(4)x2-2x+12<0

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解下列不等式.(1)X2-7+12>0(2)-x2-2x+3≥0(3)x2-2x+1<0(4)x2-2x+12<0解下列不等式.(1)X2-7+12>0(2)-x2-2x+3≥0(3)x2-2x+1<

解下列不等式.(1)X2-7+12>0(2)-x2-2x+3≥0(3)x2-2x+1<0(4)x2-2x+12<0
解下列不等式.(1)X2-7+12>0(2)-x2-2x+3≥0(3)x2-2x+1<0(4)x2-2x+12<0

解下列不等式.(1)X2-7+12>0(2)-x2-2x+3≥0(3)x2-2x+1<0(4)x2-2x+12<0
(1)X2-7x+12>0
(x-3)(x-4)>0
x>4 or x

(1)x<3或x>4;(2)-3≤x≤1;(3)空集;(4)空集。