1.9x^2-4y^2
2.81x^4-16y^4
3.(5x^2+ax-6)(4x+1)
因式分解 ....(10點)
2008-08-12 5:17 am
回答 (2)
2008-08-12 5:32 am
答1:
9x^2-4y^2
=(3x-2y)(3x+2y)
答2:
81x^4-16y^4
=( 9x^2-4y^2)( 9x^2+4y^2)
=(3x-2y)(3x+2y)(3x+2y)(3x+2y)
=(3x-2y)(3x+2y)^3
答3:
(5x^2+ax-6)(4x+1)
=20x^3+4ax^2-24x+5x^2+ax-6
=20x^3+5x^2+4ax^2-24x+ax-6
由於a係未知數，所以呢個係最後答案
9x^2-4y^2
=(3x-2y)(3x+2y)
答2:
81x^4-16y^4
=( 9x^2-4y^2)( 9x^2+4y^2)
=(3x-2y)(3x+2y)(3x+2y)(3x+2y)
=(3x-2y)(3x+2y)^3
答3:
(5x^2+ax-6)(4x+1)
=20x^3+4ax^2-24x+5x^2+ax-6
=20x^3+5x^2+4ax^2-24x+ax-6
由於a係未知數，所以呢個係最後答案
參考: 自己
收錄日期: 2021-04-13 15:56:18
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https://hk.answers.yahoo.com/question/index?qid=20080811000051KK03031