Cho đường tròn O và đường thẳng d đi qua đường tròn nhưng không qua O Lấy d cắt O tại hai điểm A,B . chọn điểm M thuộc O nằm ngoài đoạn AB kẻ MC,MD là tiếp tuyến của (O), ( C,D thuộc (O) ) Kẻ hai tiếp tuyến của (O) cắt (O) tại A,B giao điểm hai tiếp tuyến đó là I CMR I,C,D thẳng hàng

a+aa+aaa+..+aaa...a[100số a] tính tổng

Rút gọn biểu thức làm giúp em với mmmmm

rút gọn các biểu thức sau a,(x+2)²-4x b,(x-3)²+6x c,(x+4)²-x(x+8) d,x²-(2x+1)² đừng làm tắt hãy giải từng bước

Exercise 1. Give the correct form of the word in brackets: to V or V-ing 1. ……Do…………………( do) homework ( be) …………………………. necessary to get good marks. 2. ………Doing………………( do) many exercises ( be) …………………………. impotant for all students to get good marks. 3. They are thinking of ( travel) …………………….. by plane or by train. 4. My uncle wants ( travel) ……………………. by train to enjoy sightseeing 5. He is afraid of ( go) ………………………. alone at night. 6. We are looking forward to ( see) ……………………….. you soon. 7. My mother is always busy ( do) …………………….. housework. 8. She needs ( go ) ……going……………… to market every morning. 9. Tim decided ( visit) ……………. Da Nang for 3 days. 10. His parents suggested ( visit) ………………..Nha Trang . 11. Tuan denied ( break)…………… that glass window yesterday. 12. Hung practices ( learn)………….. English every day. He tries his best ( get) ……………

Vẽ một ...anime/chibi/mầm tạm biệt trong vẻ mặt buồn.........

nhanh giúp mk nha, mk sẽ cho 1 câu trả lời hay và 5 sao

Ex1. Choose the best answer A, B, C or D to complete these sentences. 1.He lives………..himself. A. in B. on C. by D. with 2.We are excited ……….our football match this afternoon. A. about B. in C. on D. of 3.Tom……helped me finish the work. A. himself B. herself C. yourself D. itself 4.My book is on the desk and ……….is on the chair. A. you B. your C.yours D. yourself 5.Is ______ your teacher? – Yes, it is A. there B. those C. these D. that 6.______ people are there in your family? A. How many B. How much C. How D. How long 7.How old is he? – He’s ______. A. fifth B. second C. first D. fifteen 8.What ______ he ______? – He’s an engineer. A. does – do B. do – does C. do – do D. does – does 9.Hoa brushes ______ teeth twice a day. A. his  B. her C. my D. your 10.Where are you? ______. A. I live in Hanoi B. I'm at school C. I'm twelve years old D. I'm fine. Thanks 11.I…………. some young trees in the garden tomorrow. A.plant B. am planting C. will plant D. B &C are correct 12. He got mark 10. He looked……………… A. happy B. happily C. happiness D. unhappily 13.What is different from the others? A. teacher  B. worker C. player D. cooker 14. ……….. many girls your class? – Yes, there are. A. There is  B. There are C. Are there D. Is there 15.Our school……….. a large playground . A. have B. has C. is D. are 16.His mother is annoyed because doesn’t try to learn, he ………….. games. A.is always playing B. always plays C. always play D.is always play 17.He ………….a teacher of English for 20 years. A. is B. are C. has been D. am

mọi người giải giúp em có luôn cách giải nhé ạ

huhu cức em đừng bỏ em mà các anh chị ơi ĐỀ: THỰC HIỆN PHÉP TÍNH