精英家教網(wǎng) > 初中數(shù)學(xué) > 題目詳情

If we have

＜0，a-b＜0 and a+b＞0，then the points in real number axis，given by a and b，can be represented as （　　）
（英漢詞典point：點(diǎn)；real number axis：實(shí)數(shù)軸；represent：表示）

A、

B、

C、

D、

分析：根據(jù)題意，有

＜0可得a、b異號(hào)，a-b＜0 可得a＜b，a+b＞0可得a＞-b，綜合可得，a＜0＜-a＜b，分析選項(xiàng)可得答案．

解答：解：根據(jù)題意，有

＜0可得a、b異號(hào)，
a-b＜0 可得a＜b，
a+b＞0可得a＞-b，
綜合可得，a＜0＜-a＜b，
分析可得，A符合．
故選A．

點(diǎn)評(píng)：本題考查實(shí)數(shù)與數(shù)軸的關(guān)系，要求學(xué)生會(huì)判斷實(shí)數(shù)的大小關(guān)系，進(jìn)而再數(shù)軸上表示．

練習(xí)冊(cè)系列答案

課堂達(dá)優(yōu)期末沖刺100分系列答案

期終沖刺百分百系列答案

全優(yōu)方案夯實(shí)與提高系列答案

提分百分百檢測(cè)卷單元期末測(cè)試卷系列答案

天下無題高效單元雙測(cè)系列答案

課堂檢測(cè)8分鐘系列答案

同步導(dǎo)學(xué)與優(yōu)化訓(xùn)練系列答案

小學(xué)期末標(biāo)準(zhǔn)試卷系列答案

小學(xué)同步AB卷系列答案

新題型全程檢測(cè)100分系列答案

年級(jí)	高中課程	年級(jí)	初中課程
高一	高一免費(fèi)課程推薦！	初一	初一免費(fèi)課程推薦！
高二	高二免費(fèi)課程推薦！	初二	初二免費(fèi)課程推薦！
高三	高三免費(fèi)課程推薦！	初三	初三免費(fèi)課程推薦！
更多初中、高中輔導(dǎo)課程推薦,點(diǎn)擊進(jìn)入>>

相關(guān)習(xí)題

科目：初中數(shù)學(xué) 來源： 題型：

7、If ax^my^pand bxⁿy^qare similar terms，then we must have （　�。ㄓh小字典：similar terms：同類項(xiàng)）

A、a=b

B、mn=pq

C、m+n=p+q

D、m=n且p=q

查看答案和解析>>

科目：初中數(shù)學(xué) 來源： 題型：閱讀理解

Rescue workers at the San Jose gold and copper mine in northern Chile had reason to sing this week．A small hole drilled into the earth became a passage（通道） to freedom for thirty-three trapped miners．They spent sixty-nine days underground．"Never have people been trapped for so long so deeply," says a doctor at NASA, the American space agency, which helped in the rescue．
But the chief medical officer for the miners said most are in good enough health to leave the hospital within a day or so．The first three were released from the hospital Thursday night．
For much of the day the miners relaxed with Chilean President Sebastian Pinera．The thirty-two Chileans and one Bolivian still wore special sunglasses to protect their eyes．
A partial mine collapse（坍塌） on 5^th of August trapped them more than half a kilometer underground．They had to stretch a two-day food supply．For two weeks no one knew if they were alive or dead．
Later, they received supplies（供給） and a video link lowered through drill holes．That link was how Ariel Ticona watched his wife give birth to their daughter．
The miners have apparently agreed to share the money they earn from selling their story．
They have already received gifts of money and travel offers．Edison Pena has been invited to the New York City Marathon and to Graceland, the home of Elvis Presley in Memphis, Tennessee．Mr．Pena described how he ran in the mine tunnels to ease the stress．And he led the miners in singing Elvis songs．
The first miner rescued on Wednesday was Florencio Avalos．The second was Mario Sepulveda, who talked about how the experience tested his faith．He said: "I was with God and I was with the devil, they fought me, but God won．He took me by my best hand, the hand of God．"
The last miner up was Luis Urzua．He was the shift leader when his crew became trapped．
Rescuers used a metal cage to pull the miners to safety in less than twenty-four hours -- faster than expected．The rescue capsule was a half-meter wide and known as the Phoenix．
【小題1】How many miners had been rescued according to the report?

A．Three

B．Sixty-nine

C．Thirty-three

D．Thirty-two

【小題2】According to the passage, when the miners were trapped, some of them did the followings except ________．

A．sharing money	B．Running to ease stress
C．Watching a video showing his wife giving birth	D．Singing songs

【小題3】
Edison Pena was invited to Graceland probably because ________________．

A．he ran in the mine tunnel．	B．he prayed to God．
C．he led the miners in singing Elvis songs．	D．he was the shift leader．

【小題4】
From the passage, we can infer the followings EXCEPT that _______________．

A．Rescue workers were happy about their rescue work．

B．People felt surprised to find the miners safe and sound．

C．People might have been quite worried about the miners’ safety．

D．The trapped miners drilled a small hole themselves to escape．

【小題5】What would be the best title for the report?

A．A mining accident	B．Miners saved, safe and sound
C．A difficult rescue	D．Miners trapped deep underground

查看答案和解析>>

科目：初中數(shù)學(xué) 來源： 題型：閱讀理解

Our thoughts, words, and actions often cause harm to others and to us. Without reconciliation (和解), we cannot deepen our understanding and only cause more suffering. "Beginning Anew" is a(n) 1 of reconciliation. It involves three steps —— sharing appreciation, expressing 2 , and expressing hurt and difficulties.
In the first step, we share appreciation. We acknowledge the 3 qualities of the other person. The second step——expressing regret, is to 4 with the other person our regrets for the things we have done or said that might have caused him or her 5 . This requires humility (謙遜), and the 6 to let go of our own pride. In the third step, we express our own hurt with mindful and loving 7 without blaming or criticizing. We speak in such a way that the other person can listen and 8 our words. If we blame the other person, his heart will 9 and he will not be able to hear us. We ask the other person to help us to understand why he has spoken and acted as he has, causing us so much pain. Perhaps, later, he can share his feelings so that we can understand him more deeply. If a strong 10 arises in us while we are expressing our suffering, we should simply 11 and come back to our breathing until the emotion becomes 12 . The other person can 13 us by following his breathing until we are ready to continue. We can enjoy practicing "Beginning Anew" with our partner, our family, or our friends 14 . By doing this, we will 15 misunderstandings from accumulating. Rather, we will take care of them as they arise, as we take care of our children.

1.	A.	method	B.	practice	C.	example	D.	experience
2.	A.	concern	B.	belief	C.	regret	D.	sympathy
3.	A.	positive	B.	poor	C.	confident	D.	selfish
4.	A.	chat	B.	compare	C.	debate	D.	share
5.	A.	pain	B.	anxiety	C.	confusion	D.	loss
6.	A.	willingness	B.	kindness	C.	happiness	D.	weakness
7.	A.	speech	B.	letter	C.	story	D.	question
8.	A.	choose	B.	accept	C.	spread	D.	change
9.	A.	open	B.	close	C.	beat	D.	melt
10.	A.	emotion	B.	responsibility	C.	value	D.	interest
11.	A.	continue	B.	stop	C.	leave	D.	repeat
12.	A.	quieter	B.	warmer	C.	deeper	D.	stronger
13.	A.	forget	B.	support	C.	hate	D.	remember
14.	A.	quickly	B.	carefully	C.	regularly	D.	willingly
15.	A.	prevent	B.	protect	C.	separate	D.	forbid

查看答案和解析>>

科目：初中數(shù)學(xué) 來源： 題型：閱讀理解

America is a mobile society. Friendships between Americans can be close and real, yet disappear soon. They don ’t feel hurt. If the same two people meet again, even years later, they pick up the friendship .This can be quite difficult for us Chinese to understand .Friendships between us develop more slowly but may become lifelong feelings, extending（延伸）deeply into both families.
There is another difficult point for us to understand . Although Americans treat friends warmly in their personal everyday lives, they don’t show their politeness to them if it requires a great deal of time. But in China ,we are usually generous with our time. We, as hosts, will appear at an airport even in the middle of the night to meet a friend. We may take days off from our work to act as guides to our friends .It is opposite in America , Americans can not manage the time to do a great deal with a visitor outside their daily plans. They will probably expect the visitors to get themselves from the airport to the hotels. And they expect the visitors will phone them from there. Once the visitors arrive at their homes , the welcome will be full , warm and real. For Americans , it is often considered more friendly to invite a friend to their homes than to restaurants, except for business matters. Americans are ready to receive us foreigners at their homes, share their holidays, and their home life. So accept their hospitality（好客）at home and enjoy your visit in America!
【小題1】The underlined phrase “pick up” in Paragraph 1 may mean “_______”.

A．keep out

B．give up

C．pay no attention to

D．continue

【小題2】Which of the following is the typical （典型的）way of American hospitality?

A．Treating friends at home.

B．Taking days off to be with friends.

C．Meeting friends at the airport at midnight.

D．Sharing everything they have.

【小題3】Which of the following statements is True according to the passage?

A．Americans are always generous with their time.

B．Americans don’t feel hurt if their friendships disappear soon.