câu 1: tìm ĐKXĐ x+3/x^2+1 + x-2/x^2-1 câu 2: M=2x+1/x+1 + x-3/x+3 Để M=3 thì giá trị của x là gì? câu 3: a) Với giá trị nào của m thì hai phương trình sau tương đương? 5x - 3 = 7x + 7 và 5x - m = 0 b) Tìm m để phương trình sau có nghiệm x = 1 : 3(2x + m)(x + 2) – 2(2x + 1) = 18

III. Read the passage, and decide whether the sentences are true (T) or false (F). Television is an important invention of the 20th century. It has been so popular that we can't imagine what life would be like if there were no television. Television is a major means of communication and entertainment. It brings pictures and sound from around the world into millions of homes. Through television, viewers can see and learn about people, places and things in distant lands. Television widens our knowledge by introducing new ideas which may lead us to new hobbies and recreations. In addition to the news, television provides us with a variety of programs that can satisfy every taste. Most people now seem to like spending their evenings watching television than to go out. 1. Television is an important means of communication. 2. Television provides us with a variety of programs. 3. Most people don't like watching TV in the evening. 4. Television can't satisfy all our tastes. 5. People can learn many things through TV.

tìm biện pháp nghệ thuật và nêu tác dụng''Trời xanh càng rộng càng cao''

Một thửa hình thang có diện tích là 450m2,đáy lớn dài hơn đáy nhỏ 15m.Tính độ dài mỗi đáy biết rằng nếu tăng đáy lớn thêm 6,5m thì diện tích thửa ruộng sẽ tăng thêm 65m2

Một cái bè có khối lượng m1 = 150( kg) đang trôi đều với vận tốc v1 = 2 (m/s) dọc theo bờ sông. Một người có khối lượng m2 = 50 (kg) nhảy lên bè với vận tốc v2 = 4 (m/s). Xác định vận tốc của bè sau khi người đó nhảy vuông góc với bè đang trôi và vuông góc với bờ sông . Bỏ qua sức cản của nước.

II. Choose the correct answer for each of the gaps to complete the following text. Television first came some sixty years ago in the 1950s. Nowadays, it is one of the most (1) sources of entertainment for both the old and the young. Television brings (2) for children, world news, music and many other (3) . If someone likes sports, he can just choose the right sports, (4) . It is not difficult for us to see why (5) is a TV set in almost every home today. 1. A.cheap B.expensive C.popular D.exciting 2. A.news B.cartoons C.sports D.plays 3. A.sets B.reports C.channels D.programmes 4. A.athletes B.channel C.time D.studio 5. A.it B.this C.that D.there

Đồng chí nào vẽ tôi 1 cái cầu vồng siu đẹp đi @_@

Tìm x (x+1)^3=64 Giups mk vs

: Combine two sentences into a new one using the given words in brackets. 1.Uncle Tom used to smoke. He seems to be in good health, (although) ……………………………………………………………………………………….. 2.I don't think my English is good. I cannot join our English Speaking Club. (enough) ……………………………………………………………………………………….. 3..1 don't come from your country. I can't understand your problems, (if) ……………………………………………………………………………………….. 4.We couldn't get tickets for the football match. We queued for an hour. ( in spite of) ……………………………………………………………………………………….. 5.No one was at home. The thieves robbed the house, (because) ………………………………………………………………………………………… 6.We didn't go to the theatre. We stayed at home, (instead of) ……………………………………………………………………………………… 7.We must replace the loudspeakers. The current ones aren't satisfactory, (since) ………………………………………………………………………………………. 8. He went out of the room. He did not say anything, (without) ……………………………………………………………………………………..… 9.They went for a picnic. We went swimming, (but) ………………………………………………………………………………………... 10.I'll come. I'll finish my work, (as soon as) …………………………………………………………………………………………

Cho 100 ml dung dịch NaOH 0,2 m vào dung dịch chứa 0,22 mol AlCl3 thu được m gam kết tủa giá trị của m là bao nhiêu