Làm giúp mình với mn ơi hứa vote 5 sao

1: Tính giá trị của biểu thức sau: a) A = 4x – ( x +3)2 + ( x+3)(x-3) với x = - 2,4 b) B = ( 3x +4)2 -10x – 9( x - 4)(4+x) với x = -0,1 c) C = ( x + 5)2 - 2 ( x – 6 )( x+ 6) + ( x+2)( x-4) với x = -1/2

cho tam giác ABC vuông tại B bt sinA =3 phần năm .Tính các tỉ số lượng giác của góc C

phải giải thích nhé nhanh lên 8h mình nộp bài giải thích dài vào mới có ctlhn mình cảm các bạn hhhhhhhhhhhhhhheeeeeeeeeeeeeelllllllllllllllllllppppppppppppppppppp 20. Choose the word whose underlined part is pronounced differently from the rest. A. advice B. machine C. Chinese D. decide 21. Choose the best answer among A, B, C or D to complete the following sentence. They are used _________outdoors and under pressure. A. to work B. to be working C. to working D. worked 22. Choose the underlined word or phrase that is in correct. Did your house built a long time ago? A B C D 23. Choose the best answer among A, B, C or D to complete the following sentence. Do you mind if I turn _________the T.V? I want to watch the news. A. off B. out C. down D. on 24. Choose the sentence which has the same meaning as the given one. She doesn’t go to china with us. A. We wish she goes to China with us. B. We wish she did went to China with us. C. We wish she went to China with us. D. We wish she can go to China with us. 25. Choose the best answer that is made from the given cues. conutries / not / those / many / to / plan / agreed / the / of A. Many of those countries agreed not to the plan. B. Many of those countries not agreed to the plan. C. Not many of those countries agreed to the plan. D. Not of many those countries agreed to the plan. 26. Choose the best answer among A, B, C or D to complete the following sentence. _________him this book if he comes. A. Gave B. Give C. Giving D. Given 27. Choose the underlined word or phrase that is in correct. When she came to my house this morning, I still slept. A B C D 28. Choose the best answer among A, B, C or D to complete the following sentence. She asked me what _________. A. is my name B. my name is C. my name was D. my name 29. Choose the best answer among A, B, C or D to complete the following sentence. - An: “I’ve passed my exam.” - Ba: “_________.” A. Good luck B. It’s nice of you to say so C. That’s a good idea. D. Congratulations! 30. Choose the best answer among A, B, C or D to complete the following sentence. - Mary: “That’s a very nice skirt you are wearing.” - Julia: “_________.” A. That’s nice B. I like it C. That’s all right D. I’m glad you like it

Chứng minh bằng cách : 2 góc so le trong bằng nhau

VI. Make questions for the underlined words for these answers. 1. ? The Ha Nhi ethnic group hasabout 12,500 inhabitants. 2. ? They live in the provinces of Lai Chau and Lao Cai. 3. ? The Ha Nhi family worship their ancestors. 4. ? They live on rice cultivation of burnt-over land or terraced fields. 5. ? They use ploughs and harrows pulled by oxen and buffaloes to work in the fields.

The World Series this year was more exciting than all the___________before. A. series B. sery C. serie D. serius

help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Do you enjoy ________ board games? a. play b. to play c. playing d. played 6. Be careful not to drop it; it’s very ________. a. unique b. fragile c. difficult d. unusual

II. Choose the best answer. 1. My dad doesn’t mind my mom from work every day. A. pick up B. picked up C. picking up D. picks up 2. Using computers too much may have harmful effects your minds and bodies. A. on B. to C. with D. onto 3. I love the people in my village. They are so and hospitable. A. friendly B. vast C. slow D. inconvenient 4. Among the , the Tay people have the largest population. A. groups B. majorities C. ethnic minorities D. ethnic cultures. 5. People in the countryside live than those in the city. A. happy B. more happily C. happily D. less happy 6. Viet Nam is multicultural country with 54 ethnic groups. A. a B. an C. the D. A and C 7. We to the countryside two months ago. A. go B. have gone C. went D. will go 8. What will you do if you the final examinations? A. will pass B. would pass C. pass D. passed 9. It rained hard. , my father went to work. A. Therefore B. However C. Because D. So 10. Your sister writes poems and stories, she? A. does B. doesn’t C. will D. won’t 11. Laura fell asleep during the lesson she was tired. A. so B. but C. because D. therefore 12. How much do you want? A. bananas B. eggs C. candies D. sugar 13. Tomorrow the director will have a meeting 8:00 am to 10:00 am. A. between B. from C. among D. in 14. We will start our trip 6 o’clock the morning. A. in / in B. at / in C. in / at D. at / at 15. We anything from James since we left school. A. haven’t heard B. heard C. don’t hear D. didn’t hear 16. You have lived in this city since 1998, ? A. haven’t you B. didn’t you C. did you D. have you 17. My students enjoy English very much. A. learn B. learnt C. learning D. to learn 18. _________ is your cat? It is two months old. A. How old B. When C. How much 19. ______ did you begin working part-time here? A. How long B. When C. How much 20. ______ people are there in the conference room? A. How B. Howmany C. How much 21. ______time will you spend on your new carpet? A. How long B. Howmany C. How much 22. _______do these shoes cost? A. How long B. Howmany C. How much 23. _______do you go to the gym? A. How B. How often C. How long 24. _____ did you get to work yesterday? I took a taxi because my car was broken. A. How B. Why C. When 25. _____were you late for work yesterday? - Because of the traffic jam A. How B. Why C. When