[(x-1)(x-4)][(x-2)(x-3)]>8
[(x²-5x)+4][(x²-5x)+6]>8
令a=x²-5x
(a+4)(a+6)>8
a²+10a+24>8
a²+10a+16>0
(a+2)(a+8)>0
a-2
x²-5x0
x(5+√17)/2
[(x-1)(x-4)][(x-2)(x-3)]>8
[(x²-5x)+4][(x²-5x)+6]>8
令a=x²-5x
(a+4)(a+6)>8
a²+10a+24>8
a²+10a+16>0
(a+2)(a+8)>0
a-2
x²-5x0
x(5+√17)/2