A:氯离子结构示意图
B:HCl的电子式
C:CO2的结构式 O=C=O
D:作为相对原子质量标准的原子614C
有下列四个论断:①﹣13是有理数;②22是分数;③2.131131113…是无理数;④π是无理数,其中正确的是( )
(Ⅰ)求不等式|f(x)﹣3|≤4的解集;
(Ⅱ)若f(x)+f(x+3)≥m2﹣2m恒成立,求实数m的取值范围.
读一读,连线。
①How is the weather? ____ A. Yes, we can.
②How many birds are there?____ B. No, I don't.
③Can we ride bikes there?____ C. It's cloudy.
④Is it windy today? ____ D. There are four birds.
⑤Do you like the rain?____ E. No, it isn't.
---Finish your homework first, or I let you go out.