Máy không có phím $\cot$ nên phải đổi sang $\tan$:
$\cot\alpha=2,5311$
$\to \tan\alpha=\dfrac{1}{2,5311}$
Bấm $\text{SHIFT}\to \text{tan}\to \dfrac{1}{2,5311}$ (để máy ở hệ đo độ góc)
Kết quả: $\alpha\approx 21^o33'$
Một hình chữ nhật có chu vi là 80m, biết chiều dài và chiều rộng lần lượt tỉ lệ với 5 :3 . Hãy tính diện tích của hình chữ nhật đó.
36. (0.400 Point) Please let/ know/order/reach/you today. 37. (0.400 Point) reason/transferring/my membership/because the price change. (0.400 Point) would/send/me/information/advertised job? 39.(0.400 Point) appreciate if you/change the time my appointment. 40.(0.400 Point) mind/postponing/our meeting/the end/May? mấy bn bik câu nào thì chỉ mình với ạ
The body The concept of ‘the body’ is closely related to the ideas of ‘illness’ and ‘healthy’. All of us exist in ‘bodies’ of different shapes, heights, colours. The main reasons for the differences are genetic, and the fact that people’s bodies change with their age. However, a huge range of research indicates that there are social factors too. Poorer people are more likely to set ‘unhealthy’ foods, to smoke cigarettes and to be employed in physically difficult work. Moreover, their housing conditions and neighbourhoods tend to be worse. All of these factors impact upon the condition of a person’s health: the physical shapes of bodies are strongly influenced by social factors. Using NO MORE THAN FOUR WORDS for each, answer the following questions. 1. In what ways do our bodies physically differ? 2. Why do our bodies differ physically? 3. What types of jobs are poor people likely to have? 4. What aspects of poor people’s living environments are not good?
giúp mình bàI HTĐ này nha mn uii
Phân tích đa thức sau thành nhân tử A=4xmũ 8 +1
x bình phuong trừ x cộng 1=2 nhân căn bậc hai của 3x-1
1. Our solar system is in a galaxy _______ Milky Way. * 1 điểm A. which was called B. called C. calling D. which called 2. The detective lost sight of the man __________ he was following. * 1 điểm A. whom B. who C. whose D. Both A and B are correct. 3. A bus is a big car ______ carries lots of people. * 1 điểm A. whose B. which C. that D. Both B and C are correct 4. The sun, __________ is one of millions stars in the universe, provides us with heat and light. * 1 điểm A. which B. that C. what D. Both A and B are correct. 5. A burglar is someone _______ breaks into a house and steals things. * 1 điểm A. who B. which C. that D. Both A and C are correct. 6. This school is only for children _________ first language is not English. * 1 điểm A. whose B. who C. which D. that 7. Do you know the girls _______ outside the church? * 1 điểm A. who stands B. who are standing C. standing D. Both B and C are correct. 8. The woman ______ daughter was crying tried to calm her down. * 1 điểm A. whom B. whose C. that D. Both B and C are correct. 9. The men _______ next-door are English. * 1 điểm A. who lives B. live C. living D. that living 10. My office, _________ is on the second floor of the building, is very small. * 1 điểm A. who B. that C. which D. where 11. This is the house _________ by his father five years ago. * 1 điểm A. which bought B. what was bought C. bought D. that is bought 12. The man _________ paid for the meal was a friend of Tom’s. * 1 điểm A. who B. whom C. whose D. which 13. He arrived with a friend ______ outside in the car. * 1 điểm A. whom waited B. who waiting C. waiting D. Both B and C are correct 14. John, __________ French and Italian, works as a tour guide. * 1 điểm A. who speak B. spoken C. Both A and B are correct D. Both A and B are incorrect. 15. The money________ in the last financial year can be reinvested on the stock exchanges. * 1 điểm A. saved B. which is saved C. saving D. which saved 16. Somewhere I’ve got a photo of the mountain __________ we climbed. * 1 điểm A. which B. where C. what D. Both A and B are correct. 17. I have lost the necklace _______ my mother gave me on my birthday. * 1 điểm A. whose B. which C. that D. Both B and C are correct 18. Laura had a wooden box, _________ she kept her photos in. * 1 điểm A. where B. which C. that D. Both B and C are correct 19. The volunteers, ______ enthusiasm was obvious, finished the work quickly. * 1 điểm A. who B. whom C. that D. whose 20. Jane works for a company _________ shoes. * 1 điểm A. that make B. that made C. making D. Both A and C are correct. 21. Mark, ________ car had broken down, was in a very bad mood. * 1 điểm A. who B. that C. whose D. which 22. The townspeople, ______ in their community is well- known, raised enough money to build a new town hall. * 1 điểm A. who proud B. who prides C. who pride D. proud 23. Electronics is a subject about __________ I know very little. * 1 điểm A. what B. which C. that D. who 24. Sarah, ________ you met yesterday, works in advertising. * 1 điểm A. who B. that C. whom D. Both A and C are correct 25. The newspaper to ______ we subscribe is delivered regularly. * 1 điểm A. that B. which C. who D. what
Cho hàm số y =3x-1 .lập bảng giá trị tương ứng của x=-1;-1/2;1/2;1;3/2
A là dung dịch H2SO4, B là dung dịch NaOH. Trộn A với B theo tỷ lệ VA: VB = 3:2 thì được dung dịch X có chứa A dư. Trung hòa 1 lít X cần 40 gam dung dịch KOH 28%. Mặt khác nếu Trộn A với B theo tỷ lệ VA: VB = 2:3 thì được dung dịch Y có chứa B dư. Trung hòa 1 lít dung dịch Y cần 29,2 gam dung dịch HCl 25% . Tính nồng độ mol của A và B ?
giúp 2 bài cuối với :3 nếu không làm được bài cuối thì thôi ạ =))
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