还有几道因式分解题!(1)x^4-7x^2+1(2)x^4+x^2+2ax+1-a^2(3)(c-a)^2-4(b-c)(a-b)

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还有几道因式分解题!(1)x^4-7x^2+1(2)x^4+x^2+2ax+1-a^2(3)(c-a)^2-4(b-c)(a-b)

还有几道因式分解题!(1)x^4-7x^2+1(2)x^4+x^2+2ax+1-a^2(3)(c-a)^2-4(b-c)(a-b)
还有几道因式分解题!
(1)x^4-7x^2+1
(2)x^4+x^2+2ax+1-a^2
(3)(c-a)^2-4(b-c)(a-b)

还有几道因式分解题!(1)x^4-7x^2+1(2)x^4+x^2+2ax+1-a^2(3)(c-a)^2-4(b-c)(a-b)
x^4-7x^2+1
=(x^2-7/2)^2-45/4
=[x^2-(7+3√5)/2]=[x^2-(7-3√5)/2]
=[x^2-(3+√5)^2/4][x^2-(3-√5)^2/4]
=[x-(3+√5)/2][x+(3+√5)^2/4][x-(3-√5)^2/4][x+(3-√5)^2/4]
x^4+x^2+2ax+1-a^2
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