问题
填空题
在下面等号右侧两个分数的分母括号处,各填上一个自然数,并且使这两个自然数的和最小:1=
|
答案
设第一个括号是x,第二个括号是y,
∵1=
+1 x
,9 y
∴x+y=(x+y)(
+1 x
)=10+9 y
+y x
≥169x y
当x+y最小值时,x=4,y=12,
故答案为4,12.
在下面等号右侧两个分数的分母括号处,各填上一个自然数,并且使这两个自然数的和最小:1=
|
设第一个括号是x,第二个括号是y,
∵1=
+1 x
,9 y
∴x+y=(x+y)(
+1 x
)=10+9 y
+y x
≥169x y
当x+y最小值时,x=4,y=12,
故答案为4,12.
从方框中选择适当的句子补全对话。
Li Peng (L) and Yang Bin ( Y) are talking about what they are going to do in the future. L: What are you going to do when you are older? Y: I hope I will become a pilot. That way I would travel around the world. L: __1___ Y: Of course I do. I like to visit different places, make different friends and learn different things. L: That sounds good. You look healthy. __2___ Y: It's just so-so. I find it hard to learn it well. L: What can you do if you are not good at English? Y: ___3__ I'll try to learn it better. __4___ L: Maybe I'll be a businessman. I'd like to go shopping and make some money. Y: __5___ L: Because I think being busy is better than doing nothing. Y: Yes. I agree with you. |