已知A={1,2,a²-3a-1},B={1,3},A∩B={3,1},求a的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/03 09:45:48
![已知A={1,2,a²-3a-1},B={1,3},A∩B={3,1},求a的值](/uploads/image/z/5127823-55-3.jpg?t=%E5%B7%B2%E7%9F%A5A%3D%7B1%2C2%2Ca%26%23178%3B-3a-1%7D%2CB%3D%7B1%2C3%7D%2CA%E2%88%A9B%3D%7B3%2C1%7D%2C%E6%B1%82a%E7%9A%84%E5%80%BC)
x){}Km
utՔ
-uu
ku@Ƶ::V:@gjyڰ&Hv6ڎAVYPAW8QAD ,km H5Qx1M!SF 1, `
已知A={1,2,a²-3a-1},B={1,3},A∩B={3,1},求a的值
已知A={1,2,a²-3a-1},B={1,3},A∩B={3,1},求a的值
已知A={1,2,a²-3a-1},B={1,3},A∩B={3,1},求a的值
a²-3a-1 = 3
a² - 3a -4 =0
(a-4)(a+1)=0
a=4 或 a = -1