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

问题描述:

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