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Answers
(与式)=(x^2-x-2)(x^2-x-12)+24
ここで、x^2-x=Aとおくと、
(与式)=(A-2)(A-12)+24
=A^2-14A+24+24
=A^2-14A+48
=(A-6)(A-8)
=(x^2-x-6)(x^2-x-8)
=(x+2)(x-3)(x^2-x-8)…(答)
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