Các bạn ui ơi làm ra vở hộ mình nha đi mà đc ko

giúp mình vs cảm ơn mn chứng minh đẳng thức

Bài1: cho chóp S.ABCD, đáy ABCD là hcn, AB=2a, AD=a, (SAB)&(SAD) cùng vuông góc với đáy. Góc giữa (SAB) và (SBD) =45°. Tính thể tích S.ABC Bài 2: cho S.ABC, đáy ABC vuông cân ở A. AB=2a, SA vuông với đáy. d(A,(SBC))=4a/3. Tính thể tích Moi nguoi giai giup to!!!!

Tìm `x,y,z` biết:`10x^2+y^2+4z^2+6x-4y-4xz+5=0`

Tìm `x in` $\mathbb{I}$ biết: `x^3-7x^2+3x+6=0`

KHÔNG GHI LẠI ĐỀ làm 2 bài sau Tìm lỗi sai và sửa lại 4. There is a museum on the right of my house. 5. How much money is the table? 6. She is going to travel to Thailans for a little days. 7. Which colour is it? Circle the best answer A, B, C or D 1. My sister is very fond .................... chocolate candy. A. of B. about C. with D. at 2. I have studied English ....................eight months. A. for B. since C. by D. in 3. Listen ....................our teacher ! A. with B. to C. for D. in 4. There isn’t ....................food in the house. A. none B. no C. some D. any 5. He arrives …………………..at six o’clock. A. at home B. home C. in home D. to home 6. Herbert has had his car………………….. 1999. A. ago B. since C. to D. for 7. How long will it ....................to get there ? A. cost B. lose C. make D. take 8. I ....................it to you if you don’t have one. A. give B. gave C. will give D. would give 9. ....................your homework yet ? A. Did you finished B. Are you finishing C. Do you finish D. Have you finished 10. It’s the best book I …………………..read. A. have ever B. had ever C. will ever D. can ever 11. He looked very..................when I told him the news. A. happily B. happy C. happiness D. was happy 12. She is ..................in history. A. interests B. interested C. interesting D. being interest 13. Is the Eiffel Tower taller....................Big Ben ? A. then B. than C. as D. of 14. At school, David was..................anyone else in his class. A. as clever as B. as clever than C. cleverer as D. cleverest 15. She speaks French ....................than you. A. more faster B. more fluently C. well D. the most fluently 16. It began to rain while we…………………..soundly. A. slept B. were sleeping C. have slept D. are sleeping 17. She doesn’t like coffee, does she ? A. Yes, she doesn’t B. No, she does C. Yes, she did D. No, she doesn’t 18. I won't go to bed …………………..I finish my homework. A. until B. when C. while D. since 19. Is this book ………………….. ? Yes, it's mine. A. you're B. yours C. you D. your 20. …………………..do you come to school ? By bus A. How B. What C. By D. When

Helppppppppppppppp me !!!!!!!!!!!!!

d, ax^2+a^2y-7x-7y e, ax^2+ay-bx^2-by f, x(x+1)^2+x(x-5)-5(x+1)^2

Giải giúp em vs ạ E cảm ơn nhiều

Task 1: Put these sentences into the active voice: Đổi sang câu chủ động 1. These artificial flowers are made of silk. 2. The lesson are being written by the students now. 3. These exercises were done well. 4. What was being done to help the poor in the city? 5. No mistakes have been made in his composition. 6. This dress must be washed in cold water. 7. This job has to be done at once. 8. These animals at the zoo are fed twice a day.