Cho `a , b , c > 0` . Chứng minh rằng : `P = (a(b + c))/(a^2 + (b + c)^2) + (b(a + c))/(b^2 + (a + c)^2) + (c(a + b))/(c^2 + (a + b)^2) ≤ 6/5`

Tìm điểm giống và khác nhau giữa đơn theo mẫu và đơn ko theo mẫu .Cho biết trong đơn nội dung bắt buộc là nội dung j.

They asked me what did happen that evening, but I couldn’t tell them. Tìm chỗ sai và sửa lại A. What did happen B. That evening C. Couldn’t D. Tell them

Hãy tìm thật nhiều tài liệu về ô nhiễm nguồn nước , lưu ý không chép mạng

Giúp mình với nhé!!! Mình cảm ơn.

Tony and his friend…(1)have a trip to Viet Nam next summer.At first,they are going to Hanoi…(2)plane and they are going to stay there in two days.Then they are going to travel to Ha Long and Hue.They a going to visit a…(3)of places of interest and some frimary schools in Hanoi.They are going to…(4) students in the schools practice speaking English.Finally,they are going to fly back to England…(5)Hanoi. 1) A. is going to B. are to C. are going to D. had to 2) A. to B. by C.with D. for 3) A. many B. some C.few D. lot 4) A.hepl B. visit C.ask D. go 5) A. to B.from C.for D. on

1. She is ....... singer I’ve ever met. * 1 điểm A. worse B. bad C. the worst D. badly 2. Mary is ....... responsible as Peter. * 1 điểm A. more B. the most C. much D. as 3. It is ....... in the city than it is in the country. * 1 điểm A. noisily B. more noisier C. noisier D. noisy 4. She sings ……….. among the singers I have known. * 1 điểm A. the most beautiful B. the more beautiful C. the most beautifully D. the more beautifully 5. She is ....... student in my class. * 1 điểm A. most hard-working B. more hard-working C. the most hard-working D. as hard-working 6. The English test was ....... than I thought it would be. * 1 điểm A. the easier B. more easy C. easiest D. easier 7. English is thought to be ....... than Math. * 1 điểm A. harder B. the more hard C. hardest D. the hardest 8. Jupiter is ....... planet in the solar system. * 1 điểm A. the biggest B. the bigger C. bigger D. biggest 9. She runs …… in my class. * 1 điểm A. the slowest B. the most slow C. the slowly D. the most slowly 10. My house is ....... hers. * 1 điểm A. cheap than B. cheaper C. more cheap than D. cheaper than 11. Her office is ....... away than mine. * 1 điểm A. father B . more far C. farther D. farer 12. Tom is ....... than David. * 1 điểm A. handsome B. the more handsome C. more handsome D. the most handsome 13. He did the test ……….. I did. * 1 điểm A. as bad as B. badder than C. more badly than D. worse than 14. A boat is ....... than a plane. * 1 điểm A. slower B. slowest C. more slow D. more slower 15. My new sofa is ....... than the old one. * 1 điểm A. more comfortable B. comfortably C. more comfortabler D. comfortable 16. My sister dances ……….. than me. * 1 điểm A. gooder B. weller C. better D. more good 17. My bedroom is ....... room in my house. * 1 điểm A. tidier than B. the tidiest C. the most tidy D. more tidier 18. This road is ....... than that road. * 1 điểm A. narrower B. narrow C. the most narrow D. more narrower 19. He drives ……. his brother. * 1 điểm A. more careful than B. more carefully C. more carefully than D. as careful as 20. It was ....... day of the year. * 1 điểm A. the colder B. the coldest C. coldest D. colder

Cho (P) y=2x ² và (d): y= 3x-m Tìm m để (P) và (d) cắt nhau tại 2 điểm phân biệt $x_{1},x_{2}$ thoả $x_{1}-2x_{2}=6$

Vẽ Đậu mầm tức dận nhé mình hứa tove 5 sao và cảm ơn nhé

Cho tam giác ABC vuông tại A, có AB/AC=3/4, đường cao AH=15 cm. Khi đó đọ dài CH=?