求多项式1/2(-3xy+2x²)-3(x²-1/2xy)的值,其中x=5,y=—8
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/17 03:39:41
![求多项式1/2(-3xy+2x²)-3(x²-1/2xy)的值,其中x=5,y=—8](/uploads/image/z/1628397-45-7.jpg?t=%E6%B1%82%E5%A4%9A%E9%A1%B9%E5%BC%8F1%2F2%EF%BC%88-3xy%2B2x%26%23178%3B%EF%BC%89-3%EF%BC%88x%26%23178%3B-1%2F2xy%EF%BC%89%E7%9A%84%E5%80%BC%2C%E5%85%B6%E4%B8%ADx%3D5%2Cy%3D%E2%80%948)
x){Y/|P]Jm
5eCs{:uP.PIE%P
{tn{cmN)6IE6RΆ&|7h(Vc(CdX.tSS<;s;-
求多项式1/2(-3xy+2x²)-3(x²-1/2xy)的值,其中x=5,y=—8
求多项式1/2(-3xy+2x²)-3(x²-1/2xy)的值,其中x=5,y=—8
求多项式1/2(-3xy+2x²)-3(x²-1/2xy)的值,其中x=5,y=—8
原式=-3/2 xy+x²-3x²+3/2xy
=-2x²
=-2×5²
=-50