在线等答案啊!!(英语的)说教的别回答。
只有1是密函数
1,Y3最大,Y1约为 4,Y2约是8的算术平方根。因此 选A
2, 解:由 题意 X 小于 2 - 3X,那么 X 小于1/2.
3,解:当 a在 (0,1)区间时,根据题设 a/2 = a的平方,a=1/2 ,符合要求;
当 a大于1时, 2a = a的平方,a=2,符合要求。 因此 a=1/2 或者a=2。
4,解:由 增函数 知 a大于1. 由一次函数表达式 的增函数性质 知 4 - a/2 大于0.即 a小于8
综上,a大于1 且 a小于8,写成开区间形式, a 在(1,8)区间上。
5.解:底数1/3 ,写成底数3 的形式,那么指数 变成 2X -(X的平方) ,此时 2X -(X的平方)的单调区间 即所求函数的单调区间。因为 2X -(X的平方)=X(2-X),所以
在(0,2)区间上为增函数,其他区间是 减函数。
Amy sometimes ( walks home).
2.I completed the work by myself.(同义句)
I completed the work ( alone).
3.I spent 400 yuan in buying that recorder.(同义句)
I spent 400 yuan ( on)the recorder
4.The teacher (had a meeting) yesterday.(就括号提问)
( What did)the teacher( do)yesterday?
5.Why did Chen Na leave home hurriedly?(同义句)
Why did Chen Na leave home( in a hurry).
单词拼写
1.I don't think Lesson One is d(ifficult )because it has few new words.
2.Liu Mei writes very carefully.Her h( andwriting)is the best in our class.
3.Reading books and m( agazines)can make you relax.
4.His parents run a chinese r(estaurant )in China Town,many people like to have meals there.
5.The woman and her h(usband )have three children.
6.Be c( areful)when you walk across the road.
7.It is d(angerous ) when the traffic light is red.
8.Do you know when the train will a(rrive )?
9.There are 60 m( inutes)in an hour.
10.It is unhealthy to go school w( ithout)having breakfast.
11.We should know how to d(eal )with it when we are in trouble.
12.I have a new computer of my o(wn ).
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