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ax^4-9ay^4
人气:310 ℃ 时间:2020-05-15 18:14:42
解答
ax^4-9ay^4
=a(x^4-9y^4)
=a[(x^2)^2-(3y^2)^2]
=a(x^2+3y^2)(x^2-3y^2)
=a(x^2+3y^2)(x+√3y)(x-√3y) .
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