化简求值:(y-2)(y²-6y-9)-y(y²-2y-15)其中y=1/2
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/13 12:17:51
![化简求值:(y-2)(y²-6y-9)-y(y²-2y-15)其中y=1/2](/uploads/image/z/1584707-59-7.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%EF%BC%9A%EF%BC%88y-2%EF%BC%89%EF%BC%88y%26%23178%3B-6y-9%EF%BC%89-y%EF%BC%88y%26%23178%3B-2y-15%EF%BC%89%E5%85%B6%E4%B8%ADy%3D1%2F2)
x){3g6yg=Ftjʆֺf@J$1J]CSmOv57I*ҧqv6Twl PiK!PQ.T6Bܴ
.tx:64R 67Ѷr
Lals=S<;P :
化简求值:(y-2)(y²-6y-9)-y(y²-2y-15)其中y=1/2
化简求值:(y-2)(y²-6y-9)-y(y²-2y-15)其中y=1/2
化简求值:(y-2)(y²-6y-9)-y(y²-2y-15)其中y=1/2
(y-2)(y²-6y-9)-y(y²-2y-15)
=y³-6y²-9y-2y²+12y+18-y³+2y²+15y
=-6y²+18y
=-6×(1/2)²+18×1/2
=-6×1/4+9
=-1.5+9
=7.5