Moi nguoi giup em cau 3 bai 4 voi Em cam on!

Ai giải giúp t bài số 4 vs cần gấp cảm ơn

Ptr:x= Acos( 2pi t+ pi/3), biết F đh dãn max/F đh nén min =3 , gốc tọa độ tại VTCB , chiều hướng lên . Tìm t min từ khi dđ đến khi a) vật qua vị trí lxo khôg biến dạg lần 2 b) vật qua vitri thấp nhất lần 2 c) vật qua vtri F đh min lần 1

I. put the verbs in the correct forms. 1. mr alan (work) ... for that company since 1990. 2. she (not take) ... music lessons last sunday. 3. the thief (go) ... away before the police came. 4. i (receive) ... your letter about 2 weeks ago. 5. when we came, they (build) ... a new library. 6. what you (do) ... now? 7. it's raining heavily. i wish it (stop) ... raining. 8. if you go to the party, i (come) ... with you. 9. most children enjoy (read) ... picture books. 10. my friend (never see) ... that sight. II. choose the words or phrases that are not correct in standard english. 1. please speak (1) loudly enough (2) for (3) the people at the back hear (4) you. 2. each of (1) the boys (2) in the (3) class have (4) his own notebook. 3. every (1) morning i spend (2) about an (3) hour to do (4) exercises. 4. they have bought (1) some furnitures (2) for (3) their new (4) houses. 5. do (1) you think (2) your parents will (3) let you to (4) go to England? 6. you must (1) put all chemicals (2) and drugs in (3) locking (4) cupboards. 7. keep (1) those medicines (2) out of (3) the children (4) reach. 8. it is (1) dangerous letting (2) the children play (3) with (4) matches. 9. it's nice (1) to (2) go on holiday without have (3) to worry about (4) money.

Viết đoạn văn 200 chữ trình bày suy nghĩ về sự khắc nghiệt của thời gian

Các nhân tố hình thành đất?????

1. tìm giá trị nhỏ nhất : a ) D = 4x ² - 4x các bạn ơi mình cần gấp giải giúp mình vs

Enzym thủy phân là oxydoreductase đúng hay sai?

Ex 1 : in each of the following sentences there is a mistake . underline that mistake and correct it 1. I asked the nurse to check your weigh again 2.The heavy rain prevented us by enjoying the trip 3.She gave some medicines to make you to feel better 4.Why do childre afraid of going to see the dentist 5.A Frenchman invents a deep-sa diving vessel in the early 1940s GIÚP MÌNH VỚI Ạ ! MÌNH CẦN GẤP

at/100/degrees/water/boils/centigrade