对任意实数a,b,定义F(a,b)= (a+b-|a-b|),如果函数 ,那么 的最大值为 . 答案: 2 下列对话中,后面划有横线的一行都有一处错误,请指出来,并将正确答案写在横线上。
A:Hello, Li Lei!
B:Hello,
Mike! Where are you going to? 1. ________
A:I'm going to the shop. Do you want go, too? 2. ________
B:Yes.
Is the shop open in this time of day? 3. ________
A:Yes, I think so. It open in the afternoon. 4.
________
B:But
it's Saturday today. Is the shop close on Saturday afternoon? 5. ________
A:We can phone to them and find out. 6.
________
Are
you know their number? 7.
________
B:No,
I don't. Let's find it on the phone book. 8. ________
A:That's good idea. But where is the phone
book? 9. ________
I
can't find it somewhere. 10.
________