(3x+y)(x-3y)的平方-(3x-y)的平方(x+3y)=?
回答 (2)
2016-10-02 4:50 am
✔ 最佳答案
猜想你的題目為(3x+y)[(x-3y)]^2-(3x-y)^2(x+3y)=(3x+y)(x^2-6xy+y^2)-(9x^2-6xy+y^2)(x+3y)
=3x^3-17x^2y-3xy^2+y^3-(9x^3+21x^2y-17xy^2+3y^3)= -6x^3-38x^2y+14xy^2-2y^3
2016-10-14 12:59 am
-6x^3-2x^2y+12xy^2+6y^3
收錄日期: 2021-04-18 15:35:36
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20161001054550AAXkTik