222中3个2表示的大小( )。
A:一样
B:不一样
C:无法确定
若f(x)=ex﹣ae﹣x为奇函数,则f(x﹣1)<e﹣1e的解集为____
看图,读一读,选择适当句子补全对话。
A. Would you like some milk?
B. We can read books at home.
C. Good idea.
D. How is the weather in winter?
E. Why don't you play football?
用如图所示的几种简单机械提起相同重物G,机械自重不可忽略,不考虑摩擦,则最小的力是( )