求值:(9-a²)²-(3-a)(a+3)(a²+9),其中a=-1 先化简,再求值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 13:02:59
![求值:(9-a²)²-(3-a)(a+3)(a²+9),其中a=-1 先化简,再求值](/uploads/image/z/1788717-21-7.jpg?t=%E6%B1%82%E5%80%BC%3A%289-a%26%23178%3B%29%26%23178%3B-%283-a%29%28a%2B3%29%28a%26%23178%3B%2B9%29%2C%E5%85%B6%E4%B8%ADa%3D%EF%BC%8D1+%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC)
求值:(9-a²)²-(3-a)(a+3)(a²+9),其中a=-1 先化简,再求值
求值:(9-a²)²-(3-a)(a+3)(a²+9),其中a=-1 先化简,再求值
求值:(9-a²)²-(3-a)(a+3)(a²+9),其中a=-1 先化简,再求值
(9-a²)²-(3-a)(a+3)(a²+9)
=(9-a²)²+(a-3)(a+3)(a²+9)
=(9-a²)²-(9-a²)(a²+9)
=(9-a²)((9-a²)-(a²+9))
=2a²(a²-9)
=2×(1-9)
=-16