phân tích thành nhân tử: x(x+y)^2-y(x+y)^2+xy-x^2

Đặt lại nha Vẽ mầm cây Ai có nhu cầu đặt biệt danh vô bl tui rep all Mong Ad không xoá nữa ạ

Mới học đến ĐỐI XỨNG TÂM nên ko dùng những kiến thưc chưa học

III. Find the mistake in the four underlined parts of each sentence and correct it. 1. If you don’t study your mathematics, you can’t be able to do the exercises. A B C D 2. My niece can read by the time she was four years old. A B C D 3. Most ants could lift objects that are ten times heavier than their own bodies. A B C D 4. Tom won’t be able to working in the shed because he is ill. A B C D 5. Bob was in an accident, but he won’t be able to remember how he had hurt himself. A B C D 6. That’s my sister over there. She stands next to the window. A B C D 7. Tom can’t listen to music because his CD player was broken. A B C D 8. We couldn’t hear the teacher because the students was very noisy. A B C D 9. Robots can work everywhere on the world, including on the seabed or in a volcano. A B C D 10. Teaching robots can explain the lessons again or help students on their homework. A B C D 11. A robot can builds houses, apartments and offices. A B C D 12. Scientists are working on how to invent a intelligent robot. A B C D 13. The children can work in groups when they were at school yesterday. A B C D 14. Children couldn’t stayed at home alone when they were 5 years old. A B C D 15. I don’t agree of you that a robot will be able to understand what people say. A B C D 16. Vy is really excited with her first day at school. A B C D 17. There are a living room, three bedrooms, a bathroom and two toilets in my house. A B C D 18. I'm going to Hoan Kiem Lake watching fireworks tonight (D). A B C D 19. Tom is a talkative student. He never talks in class. A B C D 20. There are many good restaurant and amusement parks in our neighborhood A B C D

Tại sao xiêm lại giúp nguyễn ánh đưa quân snag đánh nước ta vào năm 1785

Hòa tan hoàn toàn một lượng hỗn hợp A gồm CaO, CaCO3 bằng dd HCl vừa đủ, thu được dd B và 5,6l khí CO2 (đktc). Đem cô cạn dd B, thu được 33,3g muối khan a)Xđ % khối lượng mỗi chất có trong hỗn hợp A b) tính thể tích dd HCl 7,3%(D=1,15g/ml) cần dùng để hòa tan vừa hết hỗn hợp A c)dẫn toàn bộ khí co2 trên vào bình chứa 200ml dd nước vôi trong 1M, Tính khối lượng kết túainh ra

II. Write conditional sentences from these statements. 1. We will plant more trees. The air will be fresher. If 2.We will use fewer cars. We will reduce pollution. If . 3. We will cycle to school every day. We will keep fitter. If . 4.We will use recycled products. We will save money. If . 5.People will throw rubbish into the right bin. They will keep the environment clean. If . 6.We will turn off the tap when brushing the teeth. We will save a lot of water. If . 7.People will travel more by public transport. The harmful gases in big cities will be reduced. If . 8.We will start at 6.00. We will arrive there before noon. If . 9.The boy eats so may green apples. He will be ill. If . 10.We will use reusable bags for shopping. We will reduce waste. If

Giải các phương trình sau Giúp mình với ạ

The children have gone ....... A. for shopping B. to shop C. shopping D. to shopping

Cho m gam hỗn hợp bột gồm 3 kim loại sắt Fe, đồng Cu và nhôm Al vào một bình kín có chứa 8 gam khí oxi O2. Nung nóng bình một thời gian cho đến khi thể tích khí oxi giảm xuống còn 20% so với ban đầu thì thu được 24,05 gam hỗn hợp rắn gồm FeO, Fe2O3, Fe3O4, CuO, Al2O3, Cu, Fe, Al a. Viết các PTHH xảy ra b. Tính giá trị của m