1.(4x^2+3x+4)+(2x^2-5x-7)
2.3x^2(4x^2+3x-4)
3.(2x+5)(3x-2)
4.(2x-5)(4x^2+3x-4)
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2009-04-15 1:31 am
回答 (2)
2009-04-15 3:00 am
✔ 最佳答案
1.(4x2+3x+4)+(2x2-5x-7)=6x2-2x-3
2.3x2(4x^2+3x-4)
=12x4+9x3-12x2
3.(2x+5)(3x-2)
=6x2-4x+15x-10
=6x2+11x-10
4.(2x-5)(4x2+3x-4)
=8x3+6x2-8x-20x2-15x+20
=8x3-14x2-23x+20
2009-04-16 2:08 am
.(2x-5)(4x2+3x-4)
=8x3+6x2-8x-20x2-15x+20
=8x3-14x2-23x+20
=8x3+6x2-8x-20x2-15x+20
=8x3-14x2-23x+20
收錄日期: 2021-04-23 20:36:59
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090414000051KK01541