一般將來時,一般現在時,一般過去時,現在進行時.寫出句子.然後改陳述句,疑問句,否定句.

一般將來時,一般現在時,一般過去時,現在進行時.寫出句子.然後改陳述句,疑問句,否定句.

再給你寫一組
一般將來時
Kate will go hiking this Sunday.
Will Kate go hiking this Sunday?
Kate won't go hiking this Sunday.
一般現在時
Tom surfs the internet every evening.
Does Tom surf the internet every evening?
Tom doesn't surf the internet every evening.
一般過去時
We planted trees last weekend.
Did you plant trees last weekend?
We didn't plant trees last weekend.
現在進行時
They are cleaning the room now.
Are they cleaning the romm now?
They aren't cleaning the room now.
he didn't go to schooi yesterday改為一般疑問句
一般將來時
陳述句He will come tomorrow他將明天過來
疑問句Will he come tomorrow?
否定句He will not come tomorrow
一般現在時
陳述句I am ready我準備好了
疑問句Are you ready?
否定句I am not ready
一般過去時
一般現在時句子,一般過去時,現在進行時,寫出陳述句,疑問句,否定句,各三個.
要詳細一點的.這是家庭作業..
一般現在時一般過去時現在進行時
三種句子
各寫出陳述疑問否定
個三個
I am go to english school today.I went to visit my grandparents.I am going to take atrip.Mymother is aworker.whocan tell me?I am not have sick.辛苦大的,LZ給點分吧~!
一般現在時:
The earth moves around the sun.
does the earth move around the sun?'
i don't like this school.
一般過去時
He smoked many cigarettes a day until he gave up.
did he smoke a…展開
一般現在時:
The earth moves around the sun.
does the earth move around the sun?'
i don't like this school.
一般過去時
He smoked many cigarettes a day until he gave up.
did he smoke a lot ten years ago?
I didn't take a walk in the morning.
現在進行時
Listen!She is singing an English song.
what are you doing?
she is not singing an English song.收起
一般現在時I often go to school by bike.
一般過去時It was OK.
現在進行時He is running now.
陳述I am a student .
疑問How are you?
否定I don't know .
一般現在時
I'm student. Are you student?I'm not a student.
一般過去時
I worked. Did you work?I didn't work.
現在進行時
I'm studying. Are you studying?I'm not studying.
高中數學,高手幫幫忙了!已知f(x)是一次函數,滿足3f(x+1)-2f(x-1)=2x+17,求f(x)
請把解題過程和理由寫明白好嗎?
特別是理由!
3f(x+1)-2f(x-1)=
3[a(x+1)+b]- 2[a(x-1)+b]=ax+(5a+b)=2x+17,為什麼可以代入,什麼原因?
f(x)=ax+b
3f(x+1)=3a(x+1)+3b=3ax+3a+3b
2f(x-1)=2a(x-1)+2b=2ax-2a+2b
3f(x+1)-2f(x-1)
=ax+5a+b
對照係數
a=2
5a+b=17
a=2 b=7
f(x)=2x+7
解:⑴設f(x)=ax+b,則3f(x+1)-2f(x-1)=3[a(x+1)+b]- 2[a(x-1)+b]=ax+(5a+b)=2x+17,
比較係數得a=2且5a+b=17,
∴a=2,b=7,∴f(x)=2x+7.
f(x)=ax+b,其中a不等於0
3[a(x+1)+b]-2[a(x-1)+b]=2x+17
ax+5a-b=2x+17
推出
a=2
5a-2b=17,b=-3.5
f(x)=2x+7
滿足f(ab)=f(a)f(b),a,b∈有理數的函數幫忙舉一個
對任意的a,b∈有理數,f(ab)=f(a)f(b)≥0
f(x)=x^2
f(x)=x
y=x的平方
平方等於1的實數全體
用列舉發
1和-1
已知定義在R上的函數f(x)=a−12x+1是奇函數,其中a為實數.(1)求a的值; ; ;(2)判斷函數f(x)在其定義域上的單調性並證明;(3)當m+n≠0時,證明f(m)+f(n)m+n>f(0).
(1)∵定義在R上的函數f(x)=a−12x+1是奇函數,∴f(0)=a-12=0,∴a=12 ;.(2)由(1)可得,f(x)=12-12x+1,它在定義域R上是增函數.證明:設x1<x2,∵f(x1)-f(x2)=12x2+1-12x1+1=2x1−2x2(2x1+1)(2 ;x2+1),由題設可得0<2x1<2x2,2x1-2x2<0,∴2x1−2x2(2x1+1)(2 ;x2+1)<0,故函數f(x)在R上是增函數.(3)由於函數f(x)在R上是增函數,故函數表示的曲線上任意兩點連線的斜率大於零,故當m≠n時,f(m)−f(n)m−n>0,換元可得f(m)−f(−n)m−(−n)>0=f(0),即f(m)+f(n)m+n>f(0).∴要證的不等式成立.
定義在R上的函數f(x),滿足當x>0時,f(x)>1,且對任意的x,y屬於R,有f(x+y)=f(x)乘以f(y),f(1)=2.
(1)求f(0)的值
(2)求證:對於任意x屬於R,都有f(x)>0;
(3)解不等式飛(3-x2)>4
(3)中飛指的是f
1、對任意的x,y屬於R,有f(x+y)=f(x)乘以f(y),令x=0,y=1,得f(1)=f(0)*f(1),又f(1)=2所以f(0)=12、由題意和1、得,x≥0時,f(x)>0成立當x<0時,另y=-x則,f(x-x)=f(0)=f(x)* f(-x)得f(x)=1/f(-x),因…
b屬於實數集a加b等於1 a的平方加b的平方的最小值
需要用一元二次不等式解答
0.5
a+b=1
a=b-1
a²;+b²;=(1-b)²;+b²;=2b²;-2b+1=2(b-1/2)²;+1/2>=1/2
當a=b=1/2時取最小值1/2
請幫我解道數學題:設函y=f(x)是定義域在R的增函數,且f(x)>0.對於任意的實數x、y.都有f(x+y)=f(x)f(y).當x >0時.f(x)>1.(1)求f(0)的值.(2)若f(1)=2,解不等式f(x)f(x +1)
1.根據f(x+y)=f(x)f(y)
所以f(0)=f(0+0)=f(0)f(0)=f(0)平方
所以f(0)=1
2.f(1)=2
所以f(2)=f(1+1)=f(1)f(1)=2*2=4
f(x)f(x +1)=f(x+x +1)=f(2x +1)
因為f(x)f(x +1)
1、令x=0,代入條件有f(0+y)=f(y)=f(0)f(y),則f(0)=1
2、由條件,則f(x)f(x +1)=f(x2+x),由f(1)=2,則4=2*2=f(1)*f(1)=f(2),由y=f(x)是增函數,則f(x2+x)
已知可導函數f(x)(x∈R)滿足f′(x)>f(x),則當a>0時,f(a)和eaf(0)大小關係為()
A. f(a)<eaf(0)B. f(a)>eaf(0)C. f(a)=eaf(0)D. f(a)≤eaf(0)
由題意知,可設函數f(x)=e2x,則導函數f′(x)=2•e2x,顯然滿足f'(x)>f(x),f(a)=e2a,eaf(0)=ea,當a>0時,顯然 ; ;e2a>ea,即f(a)>eaf(0),故選B.