(x²-7x+12)(x²+x+1)>0,解不等式
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(x²-7x+12)(x²+x+1)>0,解不等式
(x²-7x+12)(x²+x+1)>0,
解不等式
(x²-7x+12)(x²+x+1)>0,解不等式
(x²-7x+12)(x²+x+1)>0
因为x²+x+1=(x+1/2)²+3/4>0
所以(x²-7x+12)>0
(x-3)(x-4)>0
x>4或x