搜题请搜索小程序“爱下问搜题”
问题 填空题
将函数y=
b
x+a
+a的图象向右平移2个单位后又向下平移2个单位，所得图象如果与原图象关于直线y=x对称，那么a=______且b ______0．
答案

函数y=

b
x+a
+a的图象向右平移2个单位后又向下平移2个单位，所得函数的解析式为y=
b
x-2+a
+a-2

又所得图象如果与原图象关于直线y=x对称，故函数y=

b
x-2+a
+a-2与y=
b
x+a
+a互为反函数

由y=

b
x+a
+a得x=
b
y-a
-a，即y=
b
x+a
+a的反函数为x=
b
y-a
-a，

故x=

b
y-a
-a与y=
b
x-2+a
+a-2为同一函数，由此得a-2=-a解得a=1

又当b=0时，函数为y=1，没有反函数，故b≠0

故答案为 1，≠

单项选择题 A1/A2型题

急性心肌梗死4小时，最适宜的治疗方案（）。

A.哌替啶

B.静滴硝酸甘油

C.射频消融治疗

D.溶栓治疗

E.糖皮质激素+扩血管药物静滴
查看答案
听力题

Some students think it d__小题1:___ to learn English well. That’s b__小题2:__ they don’t find the right way. I think r__小题3:___ is very important for students. The more you read， the b__小题4:__ you’ll understand. Reading is helpful to listening, speaking and writing.

If you often read English aloud, you’ll improve(提高) your listening. On the other hand（另一方面）, listening a lot can h__小题5:____ you to read better. Reading English everywhere when you are f_小题6:__, if you wish. You can get a lot of knowledge（知识） when you read. Sometimes you need to s_小题7:__ your ideas, you can either speak or write. That means you are using w__小题8:__ you learned from reading. The same as Chinese, the more you read, the better you can write. If you want to r__小题9:__ something, you should read again and again. So from now on, you’d better do more reading. It’s a good w__小题10:__ to learn English well.
查看答案