Bài 1 :Tìm x biết: a) |x| = 2,5 b) |x| = -1,2 c) |x| + 0,573 = 2 d) |x + 1/3 |−4=−1 Giúp em với ạ :33

Giúp với ạ, sắp nộp r 1.Tính giá trị của biểu thức a) A=365^2*(365+3*127)-127*(3*365^2+365)-365*(-127+365^2) b) B=999x^2+503x+1498x^3-1503-3x^4 với x=500 2.Tính giá trị của biểu thức a) A=2x^3-623x^2-310x-614 với x=312 b) B=2x^4-61x^3-95x^2-31x+64 với x=32 c) C=-x^5+2005x^4-2004x^3-x^2+2004x+2005 với x=2004 d) D=x^5-2005x^4-2007x^3-6014x^2+4007x với x=2004 3. a) Cho C=(3x^2y+2xy)(5xy^2-3)-15x^2(y^3x-1)+9(x^2y+1)-2xy(-3+5xy^2-xy) Chứng minh C dương với ∀x,y=R (Giúp mình với, hứa vote 5sao+cảm ơn)

Khi cho canxi cacbonat ( CaCO3) vào 14,6g axit clohidric (HCl) thấy tạo thành 22,2g canxi clorua (CaCl2),3,6g nước (H2O) và thoát ra 8,8g khí cacbon đổi (CO2). Tính khối lượng canxi cacbonat tham gia phản ứng biết có hao hụt 15% E cần gấp ạ :<

x-1 x-2 x-3 ____ - ____ - ____ -3 = 0 13 12 11 Các bạn giải giúp mk với ạ

what...he (do)...to his car now?-i (think)....he (polish)...it.

M.n jup e vs ạ ,vote 5 sao😓😓😓

có 4 hợp tử cùng loài nguyên phân số lần bằng nhau tạo ra 32 tế bào con. a)xđ số lần nguyên phân của mỗi hợp tử b)trong các tb con được tạo ra thấy có 256 tâm động cho biết tên loài. c)xđ số nst môi trường cung cấp cho quá trình nguyên phân

IV. Fill in the missing preposition of time. It was one of my usual days. I got up (1) 7 o’clock (2) the morning, washed, dressed and had breakfast (3) 7.30. Then I went to my office. There I worked with the documents till 1 o’clock (4) the afternoon. Then I had lunch (5) 1.30. After that I looked at my diary and saw that I had an important meeting with my companions (6) 3 p.m. in the cafe (7) Monday afternoon. I was short of time. I was in a hurry and forgot to take some important documents with me. I was forced to return to my office. As you could guess I was late. It was awful! I was in the café (8) 20 minutes. Luckily my companions were still there. I apologized for my being late and explained what had happened. Then we discussed some questions about the company. It was a hard day. V. Read the passage and answer the following questions. Among the many special dishes in Ha Noi, pho is the most popular. It is a special kind of Vietnamese soup. We can enjoy Pho for all kinds of meals during the day, from breakfast to dinner, and even for late night snack. Pho has a very special taste. The rice noodles are made from the best variety of rice. The broth for pho bo (beef noodle soup) is made by stewing the bones of cows for a long time in a large pot. The broth for another kind of pho, pho ga (chicken noodle soup) is made by stewing chicken bones. The chicken meat served with pho ga is boneless and cut into thin slices... It’s so delicious. 1. When can we enjoy pho? ____________________________________________________________________ 2. How is the chicken meat served with pho ga? ____________________________________________________________________ 3. What are the rice noodles made from? ____________________________________________________________________ 4. How is the broth for pho bo made? ____________________________________________________________________ VI. Read the following passage and decide if it is T or F. Many people still believe that natural resources will never be used up. Actually, world’s energy resources are limited. Nobody knows exactly how much fuel is left. However, we also should use them economically and try to find out alternative sources of power. According to Professor Marvin Burnharm of the New England Institute of Technology, we have to start conserving coal, oil and gas before it is too late; and nuclear power is the only alternative. However, many people disagree to use nuclear power because it’s very dangerous. What would happen if there was a serious nuclear accident? Radioactivity causes cancer and may badly affect the future generations. The most effective thing is that we should use natural resources as economical as possible. True/ False 1. Natural resources will run out. 1. __________ 2. The world’s energy resources are unlimited. 2. __________ 3. We should use fuel economically. 3. __________ 4. Many people agree to use nuclear power as an alternative energy 4. __________

Để đi hết 1 đường thẳng trong 1 thời gian nhất định, 1 người đi bộ với 3 vận tốc như sau, nửa đoạn đường đầu đi với vânj tốc v1= 6km/h, nửa đoạn đường còn đi với vận tốc v2= 4km/h trong nửa thời gian đầu và vận tốc v3 =5km/h trong nửa thời gian sau . Tính Vtb

1.Tìm số nguyên a,b thỏa mãn: a, -19/20 < a < -20/3 b, - 1/3 < 4/b < 1/2. 2.tìm các số tự nhiên n để 2n/n-2 nhận giá tự nguyên. sửa đề bài 2 của mình nếu sai và làm hết bài 1 , 2 nha🤞