已知XY²=-2,求代数式(XY)(X³Y的七次方-3X²Y的5次方-5Y)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 16:11:24
![已知XY²=-2,求代数式(XY)(X³Y的七次方-3X²Y的5次方-5Y)](/uploads/image/z/1591545-57-5.jpg?t=%E5%B7%B2%E7%9F%A5XY%26%23178%3B%3D-2%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F%EF%BC%88XY%29%28X%26%23179%3BY%E7%9A%84%E4%B8%83%E6%AC%A1%E6%96%B9-3X%26%23178%3BY%E7%9A%845%E6%AC%A1%E6%96%B9-5Y%29)
已知XY²=-2,求代数式(XY)(X³Y的七次方-3X²Y的5次方-5Y)
已知XY²=-2,求代数式(XY)(X³Y的七次方-3X²Y的5次方-5Y)
已知XY²=-2,求代数式(XY)(X³Y的七次方-3X²Y的5次方-5Y)
xy(x^3y^7-3x^2y^5-5y)
x^4y^8-3x^3Y^6-5xy^2
=(xy^2)^4-3(xy^2)^3-5xy^2
=(-2)^4-3(-2)^3-5(-2)
=16+24+10
=50