已知a³+b³=27,a²b-ab²=-6求(b³-a³)+(a²b-3ab²)-2(b³-a²b)的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/29 17:55:51
![已知a³+b³=27,a²b-ab²=-6求(b³-a³)+(a²b-3ab²)-2(b³-a²b)的值](/uploads/image/z/1267175-47-5.jpg?t=%E5%B7%B2%E7%9F%A5a%26%23179%3B%2Bb%26%23179%3B%3D27%2Ca%26%23178%3Bb-ab%26%23178%3B%3D-6%E6%B1%82%EF%BC%88b%26%23179%3B-a%26%23179%3B%29%2B%28a%26%23178%3Bb-3ab%26%23178%3B%29-2%28b%26%23179%3B-a%26%23178%3Bb%29%E7%9A%84%E5%80%BC)
x){}KՔ
- X:I71 ²5{"]&Mm
ZcbM]#
u@YZ6I*'Zح_`g3`h1ukĠZ4mZ
0\XKC5MLm!nP w.{Y@3aJ酙ԉ x
已知a³+b³=27,a²b-ab²=-6求(b³-a³)+(a²b-3ab²)-2(b³-a²b)的值
已知a³+b³=27,a²b-ab²=-6
求(b³-a³)+(a²b-3ab²)-2(b³-a²b)的值
已知a³+b³=27,a²b-ab²=-6求(b³-a³)+(a²b-3ab²)-2(b³-a²b)的值
(b³-a³)+(a²b-3ab²)-2(b³-a²b)
=-b³-a³+a²b-3ab²+2a²b
=-(a³+b³)+3a²b-3ab²
=-(a³+b³)+3(a²b-ab²)
=-27+3*(-6)
=-27-18
=-45
(b³-a³)+(a²b-3ab²)-2(b³-a²b)=﹣(a³+b³﹚+3﹙a²b-ab²﹚=﹣45