ask a maths question在实数范围内分解因式9x^4-25

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ask a maths question在实数范围内分解因式9x^4-25
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ask a maths question在实数范围内分解因式9x^4-25
ask a maths question
在实数范围内分解因式
9x^4-25

ask a maths question在实数范围内分解因式9x^4-25
9x^4-25
=(3x^2+5)(3x^2-5)
=(3x^2+5)(√3x+√5)(√3x-√5)

9x^4-25 =(3x^2+5)(3x^2-5)

=(3x^2)^2-5^2=(3x^2+5)*(3x^2-5)

原式=(3x^2+5）（3x^2-5)

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