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giúp em trl câu hỏi “từ xưa đến nay dân tộc ta luôn thể hiện nhiều đạo...”

Cho tam giác ABC cân tại A. Gọi E,F lần lượt là trung điểm của AB,AC. a) Tính độ dài EF biết BC = 12cm b)Lấy điểm I là trung điểm BC. C/m tứ giác IEFC là hình bình hành. c) Kẻ BH vuông góc với AC tại H. C/m tứ giác EFHI là hình thang cân.

Cho hình chóp S(ABCD) . có đáy là hình chữ nhật, SA vuông góc ABCD và F là trung điểm BC. Biết AD=AB=2a, SA=3a. Côsin góc giữa hai đường SB và FD bằng

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Giúp mình với ạ Chỗ NaOH với naoh ấy ạ

Exercise 5: Put the verbs in brackets into the present tenses. (simple, continuous, perfect) I often ____________e-mail to keep in touch with my friend. (use) He ____________at the library at 7a.m every day. (work ) _______Nam and Huy often ___________swimming twice a week ? (go) The Sun _________in the east and ____________in the west. ( rise / set ) Hoa ___________the piano at the moment.( practice) What ________you ________now ? ( do ) . I ____________TV with my mother. ( watch) ________Peter ___________to Susan now? (talk) Be quiet! The baby __________in the next room. ( sleep) It ________much in summer ( rain) . It ____________now. ( rain) I _______just ________my book.( finish) He _______already _____________his lessons. ( prepare) He ___________my sister since he was very young.(love) We ___________________English for 4 years.(learn) I ________________for two hours (wait), but she ________________yet. ( not come) This is the first time I _____________________to Paris. ( be) I_______________ that film several times because I like it. ( see) I __________________that novel written by Hemingway several times before. ( read) Up to the present / So far, we _______________almost every lesson in the book. ( write) We ____________________to New York lately. (travel) I ______________________him recently (not see) __________you ever _________________Huong Pagoda? ( visit) ‘You look hot’- Yes, I _______________________ (run) Carol _________________________on the phone for two hours. ( talk) Where’s Sarah? She’s outside. She __________the gardening all this morning. ( do) My sister _______________for you since yesterday. ( look) I (have).................... coffee for breakfast every morning. The student (look up) ..............new words right now. She (go) ................ to school every day. We (do) ................ exercise thirteen right at the moment. Miss Helen (look) .................. at the newspaper now. It (rain) ....................very much in summer. It (rain)................. now. Bad students never (work) ............... hard. We seldom (eat) .................. before 6.30. He generally (sing) ................ in English, but today he (sing) ............ in French. Look at the man. He (run)..................after the train. He (want) ............... to catch it. Be quiet! The baby (sleep)....................... It (be) ............very cold now. He (never watch) ...............................that television program. I (read) ................... that novel written by Hemingway several times before. I (learn)...................English since I (be) ..................eight. My friend (have).................no trouble with his car since he (buy) ..................it. I (not finish) .......................my letter yet. How long you (know) .......................Mr. Pitt? – I (know) .......................him for ten years. I can’t go out because I (not finish) .......................my work. I (buy) .......................a new house last year, but I (not sell) .......................my old house yet, so at the moment I have two houses.

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