分解因式:(x 4 +x 2 -4)(x 4 +x 2 +3)+10=______.
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令x 4 +x 2 =y,
∴原式=(y-4)(y+3)+10
=y 2 -y-2
=(y+1)(y-2)
将x 4 +x 2 =y代入,
所以原式=(x 4 +x 2 +1)(x 4 +x 2 -2)
=(x 4 +x 2 +1)(x 2 +2)(x 2 -1)
=(x 4 +x 2 +1)(x 2 +2)(x+1)(x-1)
=(x 2 +x+1)(x 2 -x+1)((x 2 +2)(x+1)(x-1)
故答案为:(x 2 +x+1)(x 2 -x+1)((x 2 +2)(x+1)(x-1).
∴原式=(y-4)(y+3)+10
=y 2 -y-2
=(y+1)(y-2)
将x 4 +x 2 =y代入,
所以原式=(x 4 +x 2 +1)(x 4 +x 2 -2)
=(x 4 +x 2 +1)(x 2 +2)(x 2 -1)
=(x 4 +x 2 +1)(x 2 +2)(x+1)(x-1)
=(x 2 +x+1)(x 2 -x+1)((x 2 +2)(x+1)(x-1)
故答案为:(x 2 +x+1)(x 2 -x+1)((x 2 +2)(x+1)(x-1).
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