Cho phương trình x² + (m - 2) x + m -3 =0 (m là tham số) a. giải pt với m=1 b.Chứng minh pt luôn có 2 nghiệm vs mọi giá trị của m

Trọng lượng của vận động viên điền kinh là 650N.Tìm động năng của vận động viên khi chạy đều hết quãng đường 600m trong 50s, g= 10m/s2

Đang cần gấp ạ em cảm ơn trước

1. It’s three years since I started learning Spanish. (FOR) I_____________________________________________________________ 2. It is difficult for my friends to understand Australian’s accent. (DIFFICULTY) My friends_____________________________________________________ 3. Tim didn’t join the summer camp because he was sick. (OF) Because_______________________________________________________ 4. Could you speak English when you were young? (ABLE) When you were young, __________________________________________? 5. Three hundred students entered the swimming competition last year. (PART) Three hundred students__________________________________________ 6. North pole is too cold for humans to live there. (SO) North pole is__________________________________________________ 7. We haven’t seen Barak for more than six months. (LAST) We_________________________________________________________ 8. I can’t wait to see the sights in London. (FORWARD) I am_________________________________________________________ 9. What time does your plane land tomorrow? (WHEN) Can you tell___________________________________________________? 10. If I were you, I would take part in the summer camp in Canada. (ADVISED) Jim__________________________________________________________

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Đun nóng 37,4 g hỗn hợp gồm Al và Fe2O3 ( tỉ lệ mol tương ứng 1:1) đến phản ứng xảy ra hoàn toàn thì thu được bao nhiêu gam Fe?

neu luận điểm luận cú của bài văn cần tạo ra thối quen tốt trong đời sống

Chọn đáp án đúng nhất để điền vào chỗ trống 1 It takes her ......to school A 20 minutes going B 20minutes to go C 20 minute togo 2 How long does it take your mother ...... all this big house: A to clean and tidy B cleaning and tidying C to clean and tidying 3 My friend finds the life in the city ......she doesn't like it at all A noise B noisy C peace 4 It takes ......a month to get used to the cold weather here: A we B them C they 5 We.... Tet holiday in VietNam special A finds B think C find 6 Do you find Long......? A intelligent and humorous B intelligence and humorous C intelligence and humor 7 I have never felt as......as.I did when I watched that horror film A terrify B terrified C terrifying D terrible 8 we like the film very much.The .....are unforgetable and the plot is gripping A characters B acting C style D action 9 The film was so .....However , my father saw it from beginning to end A interesting B exciting C boring D fascinating 10 I was......to learn that the director of that gripping film has won the first prize A interest B interests C interested D interesting

Cho 15,6 g hỗn hợp gồm Mg,Fe, Zn , Sn tác dụng hết với dung dịch hết với dung HCl thu được A và 4,48 lít khí H2 (đktc) tính khối lượng muối thu trong dung dịch A

Ai giải giúp mik vs ạ đang cần gấp