The problem focus of parabola s (- 1,1) quasilinear y = X-2 solving equation This parabola is not an upper opening or a lower opening, or a left opening or a right opening

By using the definition of parabola, the distance from any point P (x, y) of parabola to s is equal to the distance to the collimator √ [(x + 1) & # 178; + (Y-1) & # 178;] = | x-y-2 | / √ 2 √ 2 * √ [(x + 1) & # 178; + (Y-1) & # 178;] = | x-y-2 | square 2 on both sides [(x + 1) & # 178; + (Y-1) & # 178;] = (x-y-2) & # 178; 2x & nbsp

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7. If point (x, y) satisfies X & # 178; + Y & # 178; - 6x-4y + 12 = 0, then the maximum and minimum values of X / y are? The maximum and minimum values of X & # 178; + Y & # 178; are? Respectively, and the maximum and minimum values of X + y are? Respectively?
8. If the solution set of inequality (A-1) x < A-1 about X is x > 1, then the value range of a is () A. a＞1B. a≥1C. a＜1D. a≤1
9. Given that A1 = 1 in the sequence {an}, the point (an, an + 1) is on the image of function y = 3x + 2 (n ∈ n *) (I) prove that the sequence {an + 1} is an equal ratio sequence; (II) find the sum of the first n terms of the sequence {an}
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11. General present tense and present continuous tense Fill in the blanks with the present or present continuous tense 1.Miss Guo （teach）us Chinese this term.She (be) a very good teacher.She often (talk) with her.Now ,she (talk) with Lily. 2.Listen!Who (read) English?Han Meimei is.She often (read) English in the evening. 3.Where (be) Tom and Jim?They (play) football. LinTao (play) footballs too?No,he (mend) his bike. 4.Where their father (work)?He (work)on a farm.But now he (not work).He (stay) at home. 5.What time the shop (close)?It (close) at nine o'clock in the evening. 6.He (go) to school by bus every day. 7.Tom can not walk fast because he (carry) a heavy box. 9.Why is the girl (stand)at the door?(ask) her to come in. 10.It's late spring.The weather (get) o'clock and warmer.
12. The present tense, the future tense, the present continuous tense
13. The exercises are as follows He is standing under the tree__________ is he __________ ? I am reading English__________ you __________ English? He is watching TV now__________ TV now I have a good time__________ a good time. He doesn't do his home work__________ his homework. The children are drawing pictures__________ the children __________ ? There are some hills over there__________ hills over there? He often cleans the blackboard after school______ the blackboard now. &The students are singing in the classroom_____ the students ______ in the classroom? The farmers are working over there__________ the farmers __________ over there? 18. Miss Gao is making the bed__________ making the bed? 22. They are having lunch__________ ? 25. Ann doesn't do her home at home__________ her homework at home. 27. Michael often reads news after meals______ newspapers now. 4、 Fill in the blanks with the proper form of the verbs given 1.Look!They __________ ( write ) on the blackboard. 2.Because the traffic __________ ( be ) bad,I’m late. 3.He often __________ ( watch ) TV in the evening with his wife. 4.----What’s he doing?---- He __________ ( study ) English.
14. General present tense and present continuous tense 1.My mother often A eat B.eats C.eating 2.My aunt sometimes A.sing B.sings C.singing 3.Jack usually grandpa very much.A.miss B.misses C:missing 4.He _______ his homework now.A:doing B.is doing C.does 5.Lily _________ the piano now.A:playing B plays C is playing 6.Look!Tom __________ in the sea now.A:swim B:swimming C:is swimming 7.Listen!The students __________ now.A:cry B:are crying C cries 8.A bird every day.A.flies B.fly C.is flying 9.The horses often A .run B.runs C.is running 10.You A.dance B.dances C.are dancing 11.He to church on Sundays.A go B .goes C is going 12.Mom A show B.shows C.is showing 13.She A.watches B.watch C is watching 14.They _________ the mountain every day.A:climbs B:climb C is climbing 15.Don’t shout!She ________ now.A:sleeping B is sleeping C sleeps 16.He ________ the picture now.A is painting B paints C is painting 17.Look!He _________ now.A dance B is dancing C dances 18.My parents A.take B.takes C.are taking 19.That elephant two big ears.A.have B.has C.are D is A washes B.is washing C.wash 21.I __________ a letter in the mail box now A putting B am putting C put 22.I ________ a fairy tale now.A read B am reading C reads
15. Practice the present continuous tense Sentence pattern conversion: They are doing house work _____________________________________________________________ _____________________________________________________________ The students are cleaning the classroom _________________________________________________________________ _________________________________________________________________ 3. I'm playing the football in the playground _________________________________________________________________ 4. Tom is reading books in his study _________________________________________________________________ I don't know the line part of questions 3 and 4. I'm learning the present continuous tense
16. Ask for the answers in the present continuous tense 1、 Write the present participle of the following verbs work_______ sing_______ play___ __ study_______ have _______ dance ________ write___ __ take________ run_________ sit_________ shop________ swim__________ lie________ 2、 Rewrite sentences as required 1.The boy is playing basketball. Negative sentences:____________________________ General questions:_________________________ Yes______________________ Negative answer:______________________ Question on "is playing basketball"__________________________ Question on "the boy":__________________________ 2.They are singing in the classroom. Negative sentences:____________________________ General questions:_________________________ Yes____________________ Negative answer:______________________ Question on "are singing"__________________________ Question on "in the classroom"__________________________ 3、 Complete the following sentences in the present continuous tense 1.What _________ you __________ (do)?2.I _____________ (sing) an English song.3.What ________ he ____________ (mend)? 4.He ______________ (mend) a car. 5.______ you __________ (fly) a kite?Yes,_____________ . 6.______ she ___________ (sit) in the boat? 7.______ you _____________ (ask) questions? 8.We _______________ (play) games now. 9.What are you _________ (do) now?I ___________ (eat) bread. 10.It’s nine o’ clock.My father_______________ (work) in the office. 11.Look,the boy____________ (put) the rubbish into the bin. 12.__________ he__________ (clean) the classroom?No,he isn’t.He____________ (play). 13.Where is Max?He___________ (run) on the grass. 14.Listen,who____________ (sing) in the music room? Oh,Mary_____________ (sing) there. 1.Who _____ over there now? A.singing B.are sing C.is singing D.sing 2.It’s eight o’ clock.The students _____ an English class. A.have B.having C.is having D.are having 3.Listen!The baby _____ in the next room. A.crying B.cried C.is crying D.cries 4.Look!The twins _____ new sweaters. A.are wearing B.wearing C.are wear D.is wearing 5.Don’t talk here.Grandparents _____ . A.is sleeping B.are sleeping C.sleeping D.sleep 6.Tom is a worker.He ____ in a factory.His sisters _____ in a hospital. A.work/ work B.works/ work C.work/ works 7.Who _____ English best in your class? A.speak B.speaks C.speaking eight Mrs.Read _____ the windows every day. A.is cleaning B.clean C.cleans 9.We _____ music and often _____ to music. A.like/ listen B.likes/ listens C.like/ are listening 10.She _____ up at six in the morning. A.get B.gets C.getting 11.On Sundays he sometimes _____ his clothes and sometimes _____ some shopping. A.wash/ do B.is washing/ is doing C.washes/ does 12.The twins usually _____ milk and bread for breakfast,but Jim _____ some coffee for it. A.have/ have B.have/ has C.has/ have
17. English grammar exercises [present continuous tense] 1、 Conjunctions form sentences and make four forms 1、play,school,at,student,the,football,be affirmative sentence: Negative sentences: Question: answer: 2、mother,her,her,tell,stories,be affirmative sentence: Negative sentences: Question: answer: 3、drink,milk,you,be,now affirmative sentence: Negative sentences: Question: answer: 4、friend,my,listen,park,music,to,the,in,now,be Affirmation: Negation: Q: A: 5、my,father,go,fishing,be,now Affirmation: Negation: Q: A: 6、girl,the,her,wash,clothes,be Affirmation: Negation: Q: A: 7、the,read,book,English,his,be,now,boy Affirmation: Negation: Q: A: 8、they,their,fix,be,bathroom,sink,now Affirmation: Negation: Q: A: It's all in the present continuous tense
18. Present continuous tense and past continuous tense exercises and answers
19. The first few questions are changed into general questions I am sleeping She has a ballpen 3. Mike is doing his home 4. I'm writing a letter to grandma He's going up a hill I am reading 7. I'm cleaning my room 8. It looks like me 9. Mike is (doing his home) 10. I'm writing a letter to my mom 11. Is he going up a hill 12. This is an apple 13. Do you have a schoolbag 14. I have (two) cakes I have an old book 16. They're from (America) He's standing in the classroom 18. Does he have a mouth 19. He's reading (under a tree) 20. He doesn't like being late 21. I'm (fishing) now 22. I read about (two) books a week
20. Change into general questions and special questions we always do our homework in the evening he often play foodball after school