Question

过程哦！！！

7、记函数ƒ（x）=bx+2/ax+1(a≠0)
（1）试求函数ƒ（x）的定义域和值域;
（2）当a=b=1时，函数ƒ（x）得图像能否由函数y=1/x的图像变换得到？若能，则写出变换过程，并作出函数图像；若不能，则说明理由。
设有两个二次方程，他们分别是x²+2ax+1=0和ax²+ax+1=0.已知这两个方程中至少有一个有实数解，求实数a的取值范围。

Answer 1

(1)由题得:f(x)的定义域为 x不等于零。值域为[(2b/a)+1,(4b/a)+1].
(2)不能
(3)要有实数解则两方程中必须有一个方程形成的曲线与x轴有交点。
由判别式可知：4a²-4>=0(1)
a²-4a>=0(2)
两式求出结果，并求出两个集合的并集即可

追问

大哥可以把两式怎么求说下么，我数学狠差的!

Answer 2

Lesson 31
Summary writing
Frank Hawkins was telling me about his experiences as a young man. Frank used to work in a small shop as a boy. He used to repair bicycles there. He bought his own shop in 1958 and made spare parts for aeroplanes in his twenties. He employed a lot of people in a few years. His wife came into the room after a while. She wanted him to repair their grandson’s bicycle.