bài 2: tínha, (187-23)-(20-180) b, (-50+19+143)-(-79+25+48) c, S1=1+(-2)+3+(-4)+....+2001+(-2002) d, S2= 1+(-3)+5+(-7)+...+(-1999)+2001

Pls giúp mình khoanh với hứa vote 5s

tổng 4 sốlà 130. Trung cộng cua3 số là 40.Hỏi số thứ tư bằng bao nhiêu cần gấp hứ cho vote 5 hihi

Trên tia Ox , lấy 2 điểm A và B sao cho OA = 3cm , OB = 7cm . a) Tính AB ? b, Lấy điểm C sao cho A là trung điểm của OC . Tính BC ?

NEU QUUY TAC VE NHAN 2 P SO K NHAU

Bai2em lam roi xin anh chi giup em voi

Số đối của −4 ___ −5 ​ là:

phân tích 3 động tác lườn, bụng, phối hợp vì là ko có môn thể dục lên em chọn đại môn nhé mn

kể về một người bạn thân 5-8 câu

She (go) ----- to school everyday 2. There (to be) ------ big problems in many parts of the world. 3. A lot of people (go)------ to work by car. 4. Davis never (take) ------the bus to school. 5. He plays volleyball but he (not enjoy)------ it. 6. Most shops usually (open) ------ at 8.00 a.m and (close)------ at 6.00 p.m. 7. School children (wear) ------ uniform on Monday. 8. I want ( buy)----------- some stamps. 9. Ruth (live)-------- with his parents in an apartment. 10. He is writing a postcard and (watch)------- TV at the same time. Exercise 2: 1. I (see) ------- a car accident on this corner yesterday 2. Mr. John (be) -------- principal of our school since last year. 3. My father (not watch) ------- TV every night. 4. I (meet) --------- Arthur three weeks ago. 5. Yesterday the police (report) -------- that they (capture)------- the thief. 6. Someone (steal) -------- my handbag on the bus. 7. Last month I (be) ------ in the hospital for ten days. 8. Don’t call me in the afternoon. I usually (be) ------ away in the afternoon. 9. People (speak)------- English in almost Canada. 10. The dog (wag) -------- his tail whenever he (see) -------- me. Exercise 3: 1. I think he (leave) -------- as soon as he (know)--------- the news 2. He (come) -------- and (see) -------- you soon. 3. My mother (come)------ to stay with us next weekend. 4. Where you (spend) --------- your holidays next summer? 5. Violets (bloom)------- in spring. 6. They (prepare)-------- the Christmas dinner at the moment. 7. When he lived in Manchester, he (work) -------- in a bank. 8. Birds (build) -------- their nests in summer and (fly)--------- to the South in winter. 9. I (lose) --------my key. (can) ---------you help me look for it? 10. My brother (join) -------the army when he (be) ------young.