Tính hợp lí (nếu có thể) 1. 171.(-37)+173.(-51)+173.(-12) 2. -98.(32-88)-88.(98-32) 3. -(-378)+(-308)-531+22 4. -56.|-51|-54.|+51| 5. 12.( -5)²-6.(-15)

V. Complete the correct tag questions 1. You have read this article on the website, ____________________? 2. Baird produced the first TV picture in 1926, ____________________? 3. A daily newspaper was published in Germany in 1550, ____________________? 4. You don't like playing computer games, ____________________? 5. Trang didn't have much time for it, ____________________? 6. We are going to have cable TV soon, ____________________? 7. Everyone is working hard, ____________________? 8. Both I and you can’ t do this exercise, ____________________? 9. Let’s go to the zoo, ____________________? 10. Play more music, ____________________? 11. Don’t talk anymore, ____________________? 12. I am a good student, ____________________? 13. There are 35 students in our class, ____________________? 14. You’d better stay at home, ____________________? 15. Maryam won’t visit us next summer, ____________________? 16. He never goes to school late, ___________________? VII. Complete the second sentence so that it has the same meaning as the first one. 1. They began living in this village 20 years ago. ->They have ________________________________________________________________________ 2. I started to drive to work a month ago. ->I have ___________________________________________________________________________ 3. Tom began playing tennis at 6 o’clock. ->Tom has _________________________________________________________________________ 4. They last repaired the castle in 1968. ->They haven’t _____________________________________________________________________ 5. Hurry up or we will miss the bus ->If _______________________________________________________________________________ 6. I will buy that book. I will give it to you. ->If _______________________________________________________________________________ 7. Unless you study harder, you won’t pass the final exam. ->If _______________________________________________________________________________ 8. He will unhealthy. He won’t do morning exercise. ->If _______________________________________________________________________________ 9. I spent half an hour writing this letter. -> It took me _____________________________________ 10. It’s time to start. -> It’s time we ___________________________________________________ 11. Lan is working late next Saturday, so she can’t come to the party. ->Because Lan ______________________________________________________________________ 12. Because they felt tired and hungry, they sat down under the tree and had a snack. ->They felt _________________________________________________________________________ 13. They couldn’t help you because they were not here. ->They were not _____________________________________________________________________ 14. It’s time for you to go to school. -> It’s time you ______________________________________ 15. I don’t like you to come to class late. -> I’d rather you _________________________________ 16. Please keep silent in the classroom. -> I’d rather you __________________________________

Mỗi ngày bố làm việc ở nhà máy từ 8h sáng đến 4h chiều . Hỏi mỗi ngày bố làm việc mấy giờ ở nhà máy

Giúp e 2 bài này đc ko ạ? E ngu môn này

cho 1.5 gam hỗn hợp x gồm al và mg phản ứng hết với dung dịch hcl dư thu được 1.68 lít khí h2 (đktc).khối lượng của mg trong x là

a, 1-2+3-4+5-6+...+2009-2010+2011 b,|x+19|+|x+5|+|x+2011|=4x

Trong bài thơ Khi con tu hú , tác giả thể hiện tâm trạng gì ?

1)(7x-3)/(x-1)=2/3 2)(3-7x)/(1+x)=1/2 3)(1-x)/(x+1)-(3+2x)/(x+1)=0 4) (1-x)/(x+1)+3=(2x+3)/(x+1) 5) 1/(x-2)+4=(2x-3)/(x-2) 6)7/(2x-3)+1=(6-2x)/(2x-3) 7) (8-x)/(x-7)-8=1/(x-7) 8) 5/(x-2)+6/(3-4x)=0 9)(4x+7)/(x-1)=(12x+5)/(3x+4) 10) (x+1)/(x-2)=1/(x^2-4) 11) 3/(x+1)=5/(2x+2) 12) (x+2)/(x-2)-1/x=2/(x(x-2)) 13) (x+2)/x-(x^2+5x+4)/x(x+2) =x/(x+2) 14) 1/(x+1)-5/(x-2)=15/(x+1)(2-x) 15) (1-6x)/(x-2)+(9x+4)/(x+2)=(x(3x-2)+1)/(x^2-4) 16) (x+5)/(x-5)-(x-5)/(x+5)=20/(x^2-25) 17) (3x+2)/(3x-2)-6/(2+3x)=(9x^2)/(〖9x〗^2-4) 18) (x-1)/x+1/(x+1)=(2x-1)/(2x^2+2) 19) 2/(x+1)-(3x+1)/((x+1) )=1/(x+1)(x-2) 20) (x+5)/(3x-6)-1/2=(2x-3)/(2x-4)

Mình đang cần gấp Giúp mình bài 1 với ạ

Tìm các giá trị của m để ba đường thẳng sau : 3x + 2y = 5; 2x - y = 4 và mx + 7y = 11 đồng quy tại 1 điểm trong mặt phẳng tọa độ