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四年級下冊暑假作業答案

四年級下冊暑假作業答案

四年級數學暑假作業答案:一

1、34平方分米;84分;0.02噸

2、300÷6×300=15000千克=15噸

3、每公頃需要4÷5=0.8小時;每小時耕5÷4=1.25公頃

4、27222÷6981500×【(752+225)÷2】

5、36÷【100÷(12-8)-13】

6、40

7、420+(420+12)÷4

8、(1131-5×75)÷75

9、31.5÷18-31.5÷20

10、6÷3÷4算出每臺每小時耕0.5公頃,0.5×5×6=15

11、連環畫看做1份,故事書是2份還多5本,兩種書一共的245本就是3份還多5本,所以245-5=240,連環畫240÷3=80本,故事書80×2+5=165本

12、乙是甲的10倍,丙是乙的10倍也就是甲的100倍,甲:.653÷(100+10+1)=0.123

13、13×6=7890÷2=45

14、11個,21條

15、28+44=72

16、8

17、1522.6

18、第六天白天一下就爬了110米,就沒有滑下來;前五天每天爬110-40=70米,所以70×5+110=460米

19、90.05(不包括);最小應大於89.94(不包括)

20、如果被除數968加上35就剛好被這個數整除,商就是17,所以這個數(968+35)÷17

二、計算

(1)25600(2)386.6(3)7.5(4)11100

(5)三個數一組,每組分別是0、3、6、9…27,和一共是135

1、運用倒推還原(8.6-1.7×3)÷5,當然也可以設這個數為X,列方程解答。

2、129減去餘數3,再減去商3得123,就是被除數和除數的和,被除數是除數的3倍多3,所以123-3=120就是除數的4倍,120除以4就是除數等於30,所以被除數是93.

3、(39-3)÷3=12歲,39-12=27歲,老師27歲

4、相差12

5、先算油的重量:(86-53)×2=66千克。所以桶重20千克

6、6位一迴圈,2007÷6=334……3,第三個是5

7、70.25小時,0.075千克;0.34平方米

8、(18-3)×0.6+13.5

9、倒推,(40+30)×2=140,(140+20)×2=320,(320+10)×2=660

10、2160÷30=72臺,72+18=90臺,2160÷90=24天,30-24=6天,提前6天

11、(m-n)÷5

12、蘋果每千克(3.2+1.4)÷2=2.3元,一共帶了2.3×3+1.4=8.3元

13、考慮除數應該比餘數大,24-3=21,所以除數可以為7和21,商就有兩個答案

14、相加就是這個數的2倍,相減是0,相除是1,所以101-1=100就是這個數的2倍,這個數是50

15、甲數的小數點向右移動一位就是擴大10倍,才等於乙數一半,所以乙數就是加數的20倍,63÷(20+1)=3,所以甲數是3

16、距離中點150米相遇,就說明走得快的甲比比走得慢的乙就多走了兩個150米,就是多300米,甲的速度是乙的1.4倍,那麼他走得路程也是乙的1.4倍,接著就是差倍問題了,300÷(1。4-1)=750米,(750+150)×2=1800米

17、5×5×4×3=300

18、12.21,如果這個題沒做對,該好好修理一下。

19、第一把鑰匙去開,運氣太差了,連試4次都不行,就一定是最後一把鎖的鑰匙了。第二把運氣差就要試3次,以此類推,所以4+3+2+1=10次

20、0-99有20個2,100-199有20個2,200-300有120個2,共160個2

21、長和寬相差2,周長20除以2就是長和寬的和,和差問題,長:(10+2)÷2=6,寬就為4

22、有點難,要做輔助線,要補成一個大長方形ABCD,答案就等於15乘8

計算

(1)71.5(2)1÷2×3÷3×4÷4×5……÷19×20=10

(3)略

(4)111100

(5)37-3.7=33.3

(6)自己算

四年級英語下冊暑假作業答案二:

練習一

Ⅰ. 1. untidy 2. stamp 3. interview 4. least 5. fan

Ⅱ. 1. collections 2. invited 3. did, start 4. has gone 5.came

6. did , buy, have,had 7. have left, don’t forget

Ⅲ. 1~5 BBBBC 6~10 ADACC

Ⅳ. 1. will look after 2. like doing 3. To develop 4.great success

5. such as

Ⅴ. 1. My favourite 2. How many 3. to do 4. When 5. Why do

練習二

Ⅰ. 1. She is afraid to walk in the dark. 2. Are you afraid of snakes ?

3. Could you tell me how old Tom is ?

4. By the way , why don’t you look up the word in the dictionary ?

5. I have heard that there is going to be a class meeting on Friday.

Ⅱ. 1~5 CADBD 6~10 AADAB

Ⅲ. 1.when the train leaves 2. if, wanted 3. if/ whether, was

4. don’t, not 5. Be, or

Ⅳ. 1~5 BADBB 6~10 CCDBC

練習三

Ⅰ. 1. make friends 2. day by day 3. at first 4. far away

5. at that moment 6. in a few weeks 7. worry about 8. as a result

9. smile at… 10. a couple of

Ⅱ. 1. take up 2. spends, practicing 3. At first 4. to do

5. I hope you can have a good time at the party.

Ⅲ. 1~5 FBGED

Ⅳ. 1. cut down 2. in danger 3. fresh 4. save 5. important

6. protect 7. waste 8. throw 9. plant 10. beautiful

Ⅴ. 1. It seems 2. 作者; writer

3. You should tell your parents what you need 4. BCA 5. C

練習二十一

I. 1. interesting 2. bored 3. cool 4. tiring 5. interested

II. 1~5 AABAA 6~10 BAADD

III. 1. had a good time 2. rode a camel 3. fantastic 4. a lot of

5. imagine 6. lonely 7. boring 8. travel 9. by ship

10. make up my mind 11. swimming 12. skiing 13. interesting

14. although 15. happy

IV. 1. trip 2. famous 3.with 4. when 5.excited 6.visited

7. taking 8. spent 9. but 10. asleep

練習二十二

I. 1~5 CBAAA 6~7 AB

II. 1. 送行 2. go to college 3. 由…製成 4. agree with sb.

5. 穿衣服 6. fall asleep 7. 叫醒 8. depend on

III. 1. I would go to China to eat dumplings.

2. I would go to South Africa to buy some gold.

3. I would go to Australia to see koala bears.

4. I would go to Japan to climb Mount Fuji.

IV. 1~3 DBA

練習二十三

I. 1~5 CABAB 6~10 AACBA

II. 1. bad 2. dirty 3. useless 4. wet

III. 1. football 2. Victoria Adams 3. his children

4. My side is the story of his football career for Manchester United and England, and of his childhood, family and personal life.

5. He learned so fast that he was able to go around and give concerts when he was only 11.

練習二十四

I. 1. he was ill, so he didn’t come to the meeting .

2. Because they learned new skills, they won the game.

3.She spoke in a low voice so that no one could hear.

4. I wouldn’t mind going by train but I don’t like to sit on a hard seat for long hours.

5. Although Giraffes are tall, they are very gentle animals.

6. He always has some smart ideas when we ask him.

7. I worked in that factory for five years before I came to this factory.

8. We kept on dancing and singing until they all joined us.

9. I am playing football while my brother is writing a letter.

10. I will come to your place as soon as you ask me.

II. 1~5 BACBD

III. The Spring Festival is the most important festival for the Chinese. It falls on

the first day of the first month in the Chinese lunar calendar. On the eve of

the Spring Festival the Chinese have a family feast. After that they stay up till midnight to welcome the Spring Festival with firecrackers. On New Year’s Day, people visit their relatives and friends to exchange New Year’s greetings. Children receive a lot of gift money.

P3近似數普通寫成用千、萬、百萬、千萬、億為單位的數

P5一格自然數的近似數是5億,這個數最大能夠是549999999,最小能夠是450000000

P9麥子放到第28格,這一格曾經超越1億粒;第64格大約要放92233720368億粒

P11判別,3和4是錯的,其他都對。

p15角的度數:角4=60度,角5=72度,角6=36度

P19畫一畫,留意畫垂線,標上直角符號

P20認一認,梯形有5和6,軸對稱圖形是1、3、4、5

P23填一填360平方米=0.036公頃

收款收據:大寫:叄仟八佰陸拾伍元零角零分

P24選擇(3)選9個

P31想一想(1)選A、B

P43火柴算式:23x4=9228x11=30817x14=238

P45算式209x46=9614372x38=14136315x41=12915

P47處理成績最外層:(10-1)x4=36(盆)一共10x10=100盆

畫一畫算一算(21-1)x50=1000釐米1000釐米=10米(260+10)/37=10分鐘

P50數一數辨別是12個16個、12個

P53十四世紀,中國人

P55處理成績142-34=108(塊)108/2=54(塊)54/18=3(次)

P56列式計算(3)相差:75-15=60小林是60/(3-1)=30(歲)過幾年:30-15=15(年)

P58填一填2(5)在48兩頭添(5)個零才是4000008

P602填表被除數和除數同時擴充套件相反的倍數(0除外),商不變。

P61想一想填一填(3)明明騎腳踏車一共用了2.5小時,均勻每小時行12千米。

第62、63頁

1.判斷題

(1)×(水能溶解一些固體,也能溶解氣體和液體。)

(2)×(冰糖放入水中溶解後,冰糖仍存在。)

(3)×(在熱的.菜湯中放入一些豬油,豬油分解成更小的。)

(4)×(當水分蒸發後,溶解於水的物質仍存在。)

(5)×(不能溶解於水的物質,放入水中不一定都會沉到水底。比如:菜油。)

(6)√

(7)√

(8)× (聲音是能在水中傳播的。)

(9)× (聲音可以朝著四面八方傳播。)

(10)√ (沒有空氣傳播)

2.不能溶解的物質是:麵粉、油菜、土塊

3.小實驗

提示:做小實驗時儘量多放點食鹽,選擇的瓶子也儘量小瓶口,這樣觀察結果會明顯些。

結果說明:食鹽量多,瓶口小,則水面上升明顯些;食鹽量少,瓶口大,則水面上升不明顯,但原理上也是增加的,水面也是會上升的。

4.小資料的內容,希望好好讀讀,聯絡實際說說記記。

第64頁

1.選擇題

(1)C (2)A (3)C (4) C

2.判斷題

7題全部都是√

說明第(3)題:(注意區別)

把兩節電池串聯起來,能使小燈泡發光更亮。

把兩個燈泡串聯起來,能使小燈泡發光更暗。

3.小實驗

(1)自制吹管樂器原理說明

試管:水位低,試管震動快,發出聲音高。反之,水位高,試管震動慢,發出聲音低。(圖上所示應該是音高 音低)

吸管:空氣柱短,振動快,發出聲音高;空氣柱長,振動慢,發出聲音低。(圖上所示應該是音高音低)

(2)小活動

鹽水升溫燈泡變亮,鹽水降溫燈泡變暗。原因是鹽水升溫加快分子活動,水中電解質增多,加大了水的導電效能。