英語翻譯 Mr and Mrs Smith have just opened a smallrestaurant.Inorder to attract（吸引）customers，they put a notice in front of the restaurant，which said“Meals on the House for Three Days.” A foreign student who didn’t know much English happened to pass by the restaurant on the secondday.Itwas lunch time and he felt very hungry.“Well，here is a restaurant.I am going to have something to eat.”He walked towards（朝，向）the restaurant when he saw the notice.“American people are reallystrange.Theyeven eat dinners on the house！But how can I get up to the top of the house”he said to himself. He looked around and found a ladder（梯子）against a treenearby.Hewas veryglad.Butas he reached the top he heard someone shouting at him.“Hey，what are you doing up there？”Mr Smith was looking at him angrily and beside him was a policeman. “Doesn’t your notice say‘Meals on the House for Three Days’？Is it just a joke？”the foreign student answered . On hearing this，both Mr Smith and the policeman laughed.“Do you know what ON THE HOUSE means？Look it up in the dictionary，It’s free meals for the first three days！”the policeman suggested . 求翻譯= =不要機器的

英語翻譯 Mr and Mrs Smith have just opened a smallrestaurant.Inorder to attract（吸引）customers，they put a notice in front of the restaurant，which said“Meals on the House for Three Days.” A foreign student who didn’t know much English happened to pass by the restaurant on the secondday.Itwas lunch time and he felt very hungry.“Well，here is a restaurant.I am going to have something to eat.”He walked towards（朝，向）the restaurant when he saw the notice.“American people are reallystrange.Theyeven eat dinners on the house！But how can I get up to the top of the house”he said to himself. He looked around and found a ladder（梯子）against a treenearby.Hewas veryglad.Butas he reached the top he heard someone shouting at him.“Hey，what are you doing up there？”Mr Smith was looking at him angrily and beside him was a policeman. “Doesn’t your notice say‘Meals on the House for Three Days’？Is it just a joke？”the foreign student answered . On hearing this，both Mr Smith and the policeman laughed.“Do you know what ON THE HOUSE means？Look it up in the dictionary，It’s free meals for the first three days！”the policeman suggested . 求翻譯= =不要機器的

史蜜斯夫婦新開一家飯店，為吸引顧客，就在飯店前面張貼了一張啟事：三天內免費吃飯！第二天一個外國學生他懂很少的英語路過這！這時正是午飯時間，他感到很餓！看到這家飯店，打算進去吃飯.他朝飯店走去，忽然發現了那張啟…

1.從甲地到乙地，先下山後走平路，某人騎自行車從甲地以每小時12千米的速度下山，而以每小時9KM的速度通過平路，到乙地55分鐘，他回來時以每小時8KM的速度通過平路，而以每小時4KM的速度上山，回到甲地用了1.5小時，求甲乙兩地距離.
2.已知Y=AX²；+BX+C.當X=-1時，Y=8，當X=1時，Y=0，當X=2時，Y=-1，求當X=-2時Y的數值.
3.張老師騎機車的速度為45千米/時，學生步行的速度為5KM/H，學校與車站相距15KM，甲乙兩名學生從學校出發，要在50分鐘內到車站，可以請張老師用摩托送，但機車的後座只能座1人，學生不能駕車也不能利用其他交通工具，叫你設計一個方案，能使兩位學生在最短時間內到達車站，並求出最短時間.

1.設去時的下山的時間是X，
則平地的時間是：55/60-X
那麼上山的距離是：12X，
平地的距離是：（11/12-X）*9
再根據回來的速度和時間列方程：
（11/12-X）*9/8+12X/4=1.5
X=1/4
上山的距離是：12*1/4=3千米，
平地的距離是：（11/12-1/4）*9=6千米，
甲乙二地共：3+6=9千米..
2.
A-B+C=8
A+B+C=0
4A+2B+C=-1
B=4
4A+8+C=-1
4A+C=-9
當X=-2，Y=4A-2B+C=-9-8=-17
3.
讓一名學生騎著老師的機車帶著另一名學生去車站，老師走著去.
最短時間為20分鐘.（15/45）×60＝20分鐘.
如果學生不會機車，可以按照下麵的方法來
張老師帶一名學生騎機車，和剩下的那個同學步行，同時出發，
那麼張老師將第一名送到距離車站還有x千米的地方返回，接另外一位步行的學生，張老師帶後來得學生與先送的學生同時到車站.
那麼可得方程
老師送第一名花的時間（15-x）/45
第一名學生步行到達車站的時間為x/5
後來的學生先步行的距離5*（15-x）/45
又花了[15-x-5*（15-x）/45]/（45+5）的時間相遇
相遇時先步行的學生共走了5*{（15-x）/45+[15-x-5*（15-x）/45]/（45+5）}
剩下的路程為（45*x/5-x）/2+x=5x
那麼兩個之和為15km
5*{（15-x）/45+[15-x-5*（15-x）/45]/（45+5）}+（45*x/5-x）/2+x=15
x=2.5km
老師送第一名花的時間（15-x）/45=（15-2.5）/45=16分鐘40秒
第一名學生步行到達車站的時間為x/5=2.5/5=30分鐘
那麼一共花了30+16.67=46分鐘40秒
參考資料：http://zhidao.baidu.com/question/18492818.html？si=1
希望採納並加分鼓勵！~

非直角三角形知道三條邊怎樣計算面積？

最直接的就是先用余弦定理求出一個角的余弦，求出其正弦，在用公式S=1/2ab正弦c求出其面積，是這樣的吧！

一般現在時，第三人稱單數的謂語動詞為什麼加S或ES？

英語是屈折語，所謂屈折語就是要在動詞原形的基礎上在詞尾做一些變化來表現不同的人稱，時態和式，這個叫做“動詞變位”.很多歐洲語言，尤其是來源於拉丁語的語言，有很複雜的動詞變比特，每個時態每個人稱動詞都不一樣，而英…

逆命題和逆定理，
舉反例說明定理“三角形的中位線等於第三邊的一半”沒有逆定理.

三角形ABC，EF是中位線，E是AB中點，F是AC中點，如果EF=AC（這是有可能的哦），則第三邊也就是BC的一半就等於AC了，所以逆定理是不成立的.

在鈍角△ABC中，a，b，c分別是角A，B，C的對邊，若a=1，b=2，則最大邊c的取值範圍是（）
A.（1，5）B.（3，5）C.（2，3）D.（5，3）

∵a=1，b=2，∴2-1＜c＜2+1，即1＜c＜3，又△ABC為鈍角三角形，∴cosC＜0，∴根據余弦定理得cosC=a2+b2−c22ab＜0，即a2+b2-c2＜0，即c2＞5，解得：c＞5，∴5＜c＜3，則最大邊c的取值範圍是（5，3）.故選D

國中要用的動詞的原型，過去式，過去分詞

不規則動詞
動詞原形（一般現在時）動詞過去式（一般過去時）動詞過去分詞（完成時、被動語態）
1 am，is was been
2 are were been
3 beat beat beaten
4 become became become
5 begin began begun
6 blow blew blown
7 break broke broken
8 bring brought brought
9 build built built
10 buy bought bought
11 can could無
12 catch caught caught
13 choose chose chosen
14 come came come
15 cost cost cost
16 cut cut cut
17 dig dug dug
18 do did done
19 draw drew drawn
20 drink drank drunk
21 drive drove driven
22 eat ate eaten
23 fall fell fallen
24 feel felt felt
25 find found found
26 fly flew flown
27 forget forgot forgotten
28 freeze froze frozen
29 get got got
30 give gave given
31 go went gone
動詞原形動詞過去式動詞過去分詞
1 grow grew grown
2 hang hung，hanged hung；hanged
3 have，has had had
4 hear heard heard
5 hide hid hidden，hid
6 hit hit hit
7 hold held held
8 hurt hurt hurt
9 keep kept kept
10 know knew known
11 lay laid laid
12 learn learnt learnt，learned
13 leave left left
14 lend lent lent
15 let let let
16 lie lay lain
17 lose lost lost
18 make made made
19 may might無
20 mean meant meant
21 meet met met
22 mistake mistook mistaken
23 put put put
24 read read read
25 ride rode ridden
26 ring rang rung
27 rise rose risen
28 run ran rung
29 say said said
30 see saw seen
31 sell sold sold
32 send sent sent
動詞原形動詞過去式動詞過去分詞
1 set set set
2 shall should無
3 shine shone shone，shined
4 show showed shown
5 shut shut shut
6 sing sang sung
7 sink sank，sunk sunk，sunken
8 sit sat sat
9 sleep slept slept
10 smell smelt，smelled smelt，smelled
11 speak spoke spoken
12 spill spilt spilt
13 spit spat spat
14 spoil spoilt spoilt
15 stand stood stood
16 steal stole stolen
17 sweep swept swept
18 swim swam swum
19 take took taken
20 teach taught taught
21 tell told told
22 think thought thought
23 throw threw thrown
24 understand understood understood
25 wake waked，woke waked，woken
26 wear wore worn
27 will would無
28 win won won
29 write wrote written

數學應用題，幫個忙！~~~~~~~~~~~
甲、乙兩桶油的重量比是4:3，從甲桶倒25千克油到乙桶後，甲、乙兩桶油的重量比是1:2，甲、乙兩桶油原來各有多少千克？

設甲桶為4X千克乙桶為3X
（4X-25）/（3X+25）=1/2 X=15
所以甲桶為60KG乙桶為45KG

基因工程技術的發展給人類帶來的影響及在應用中存在的主要問題

基因工程是指有意識地把一個生物體中有用的目的基因轉入另一個生物體中，使後者獲得新的遺傳性狀或表達所需要的產物，也就是所謂的轉基因技術.轉基因技術現已廣泛應用於工業、農業隨著分子生物學和生物技術的迅猛發展…

there is a（c）on our teacher's desk i
there is a（c）on our teacher's desk in our classroom

clock錶，時鐘