A:友善地对待别人,和别人说话时面带微笑
B:我只干好自己的事情。
提示:⒈When and where will you go?
⒉How will you get there?
⒊How long will you stay there'?
⒋What will you do there?
⒌Why do you want to do these things there?
My holiday plan
请将图中的电灯和控制电灯的开关正确接入家庭电路中.
(Ⅰ)若a=1,求不等式f(x)>x+2的解集;
(Ⅱ)若不等式f(x)≤a(x+2)的解集为非空集合,求a的取值范围.