How to use 27 × 99 + 27 for simple calculation

RELATED INFORMATIONS

• 1. 2. The surface area of a cylinder includes () and ()
• 2. Given the polynomial x squared - 2x + 3, when x =, its maximum value is
• 3. 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?
• 4. 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
• 5. 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}
• 6. Let the joint probability density function of two-dimensional random variables (x, y) be: F (x, y) = {2; 0 < y < x < 10; others (1) Finding the edge density functions FX (x) and FY (y) of X and Y (2) Ask if x and y are independent of each other
• 7. Given that f (x) = (m-1) x2 + MX + 1 is an even function, then the sum of the maximum and minimum of F (x) in the interval [- 2,1] is equal to______ ．
• 8. Given the function f (x) = 4x * 2 -- KX 8, if the function is an even function on R, find the value of the real number K
• 9. How to combine two line segments in Geometer's Sketchpad? I made two intersecting line segments, but found that only one line segment can be moved at a time. How can I combine them into a whole
• 10. In the square ABCD, the angle pad = angle PDA = 15 degrees, proving that the triangle PBC is an equilateral triangle
• 11. Finding double integral D: x + y In polar coordinates.
• 12. This is how to simplify, the formula behind is ? （1-a∧2）-1/1-a=[（1-a∧2）*（1-a）-1]/1-a Then how does it become {a [(A-1 / 2) ∧ 2-5 / 4} / 1-A
• 13. 18 out of 25 times 9 out of 16 plus 7 out of 25 times 9 out of 16 plus 9 out of 16
• 14. 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
• 15. 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.
• 16. The present tense, the future tense, the present continuous tense
• 17. 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. 
• 18. 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
• 19. 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
• 20. 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