Biến đổi vế trái thành vế phải: (a+b).(c+d)-(a+d).(b+c)=(a-c).(d-b) giúp mik với mik đang cần gấp!!

Cho tam giác ABC cân tại A trên cạnh AB lấy điểm D, trên cạnh AC lấy điểm E sao cho AD = AE Gọi M là giao điểm của BE và CD Chứng minh rằng BE = CD Tam giác BMD bằng tam giác CME AM là phân giác góc BAC Gọi H là trung điểm BC. chứng minh ba điểm A, M, H thẳng hàng

mot manh dat hinh tam giac co do dai canh day 38m va chieu cao 30m nguoi ta danh 20% dien tich manh dat de trong rau tinh dien tich phan dat trong rau

mot manh dat hinh tam giac co do dai canh day 38m va chieu cao 30m nguoi ta danh 20% dien tich manh dat de trong rau tinh dien tich phan dat trong rau

$\left \{ {{7x - 3y = 5} \atop {$\frac{x}{2}$+ $\frac{y}{3}$}} \right.$ =2

Tiếng Anh 8 60 điểm nè cứu mình vớiiiii IV. Writing A. Rewrite these sentences. 1. “Could you help me with my English speaking, Ba?” Minh told 2. “You shouldn’t make noise in class, Trung” The teacher said___________________________________________________ 3. “Can you wait for me here, Jerry?” Tom told _________________________________________________________ 4. “Could you buy me an English exercise book, Ha?” Nam asked ________________________________________________________ 5. “ Get up early to learn your lesson, Toan” Toan’s father told him _______________________________________________ 6. “ You should improve your English pronunciation, Nga” Nga’s teacher said __________________________________________________ 7. “ You should stay in bed for a few days, Mr. Hoang” The doctor said_______________________________________________ 8. Hung is strong. He can carry that heavy box. Hung is ___________________________________________ 9. The fire isn’t very hot. It won’t boil the kettle. The fire _____________________________________________________ 10. The weather wasn’t warm. We couldn’t go swimming. The weather __________________________________________________ 11. Jane is a skillful swimmer. Jane ___ 12. Lan learns English very well. Lan is ________________________________________________________ 13. Loan is a good swimmer. Loan _________________________________________________________ 14. Hung run very fast. Hung is ________________________________________________________ 15. Plays are not as interesting as films. Films are ______ 16. English isn’t as difficult as French. French is ____________________________________________________ 17. Jill is more intelligent than Bill. Bill isn’t _______________________________________________________ 18. I’m lucky . I have a friend like you. I’m lucky enough______________________________________________ 19. My father often smoked 20 cigarettes a day, but now he doesn’t smoke any more. My father used____________________________________________________ 20. Tom is very strong. He can lift that heavy table. Tom is strong_______________________________________________________ 21. Nam’s father drank a lot of wine ten years ago but now he doesn’t . Nam ‘s father used to_________________________________________ B. Write complete sentences from the following sets of words and phrases. 1. I/ be / proud/ my sister / because/ she/ always / study well. ………………………………………………………………………………….. 2. Yesterday/ teacher/ say/ I/ work harder/ improve/ my English pronunciation. ………………………………………………………………………………….. 3. Jenny/ have/ Math/ three times/ a week. ……………………………………………………………………………….. 4. We/ receive/ report/ ago. …………………………………………………………………………………. 5. mother/ tell me/ spend more time/ History. ………………………………………………………………………………….. 6. Last semester/ she/ get good grades/ Science/ but/ chemistry results/ poor. …………………………………………………………………………………. 7. grandmother/ tell him/ write/ her once. ………………………………………………………………………………….. 8. His mother/ very sad/ he/ study/ badly every semester. …………………………………………………………………………………. 9. Bao/ spend/ free time/ doing volunteer work. …………………………………………………………………………………… 10. Song/ always/ play soccer/ every Saturday afternoon, but/ last Saturday afternoon/ he/ play basketball …………………………………………………………………………………. 11. we/ raise/ funds/ by/ collect/ waste paper/ and break/ glass. ………………………………………………………………………………….. 12. We/ going/ clean/ lakes’ banks/ weekend …………………………………………………………………………………

Giúp mình vài 10 vs mình cảm ơn

Tiếng Anh 8 20 điểm :( III. Supply the correct tense of the verbs in brackets 1. Mary and John (be) _________ neighbors. They (know) _________ each other for a long time. Mary (move) _________ into her house in 1990, and John (live) _________ next door since he (come) _________ to the area in 1988. 2. Today (be) _________ Sunday. Nga (not go) _________ to school. She (stay) _________ at home. She (do) _________ her homework now. She (do) _________ it for two hours. 3. I (be) _________ in New York. I (come) _________ here two years ago. My friend, Nancy (live) _________ here since 1982. So she (know) _________ the area very well. 4. Trung usually (go) _________ to the library three times a week. 5. Yesterday I (be) _________ busy, so I (not have) _________ time to phone you. 6. Mrs. Trang (not go) _________ to work last week. She (not be) _________ feeling well. 7. I (do ) _________ all the housework. The flat is really clean now. 8. How long you (live) _________ here? – Since 1997. 9. Mr. Quang (teach) _________ in this school since he (graduate) _________ from the university in 1989. 10. My brother (leave) _________ home 10 years ago. I (never meet) _________ him since then. 11. Where you (spend) _________ your summer holiday last year, Tam? 12. When we (be) _________ young, our family (live) _________ in the countryside. 13. I (read) _________ an interesting book at the moment. 14. How long you (know) _________ Mrs. Chi? – I (know) _________ her for five years. 15. We (not see) _________ her since we (be) _________ on holiday in Ha Long bay. 16. Phuong (finish) _________ her homework tonight. 17. It’s three years since I last (see) _________ Nam. 18. You (be) _________ away? – Yes. I (go) _________ to the country last Sunday. 19. I (not eat) _________ anything for two days. 20. They (move) _________ to Ho Chi Minh City in 1990 and (live) _________ there since then.

số 0 có phải là số chính phương không vì sao

Nguyên nhân nào dẫn đến các cuộc phát kiến địa lí ?