求值域啊.y=x²-4x-5 x属于R y=?x属于【3.4)y=?x属于【0.2) y=?x属于【0.5)y=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 16:00:39
![求值域啊.y=x²-4x-5 x属于R y=?x属于【3.4)y=?x属于【0.2) y=?x属于【0.5)y=?](/uploads/image/z/12506573-29-3.jpg?t=%E6%B1%82%E5%80%BC%E5%9F%9F%E5%95%8A.y%3Dx%26%23178%3B-4x-5+x%E5%B1%9E%E4%BA%8ER+y%3D%3Fx%E5%B1%9E%E4%BA%8E%E3%80%903.4%29y%3D%3Fx%E5%B1%9E%E4%BA%8E%E3%80%900.2%29+y%3D%3Fx%E5%B1%9E%E4%BA%8E%E3%80%900.5%29y%3D%3F)
求值域啊.y=x²-4x-5 x属于R y=?x属于【3.4)y=?x属于【0.2) y=?x属于【0.5)y=?
求值域啊.y=x²-4x-5 x属于R y=?x属于【3.4)y=?x属于【0.2) y=?x属于【0.5)y=?
求值域啊.y=x²-4x-5 x属于R y=?x属于【3.4)y=?x属于【0.2) y=?x属于【0.5)y=?
1.y=x²-4x-5=(x-2)²-9,因为(x-2)²>=0,所以y>=-9,所以y属于【-9,+无穷大).
2.当x属于【3.4)时,y单调递增,所以f(3)