Trường hợp nào dưới đây, ta nhận biết được một tờ giấy màu đen ? (25 Điểm) Dán tờ giấy màu đen lên một tờ giấy màu xanh đặt ngoài trời lúc ban ngày. Dán tờ giấy màu đen lên một tờ giấy trắng rồi đặt trong phòng tối. Đặt tờ giấy màu đen lên bàn trong phòng tối. Dán tờ giấy màu đen lên một cái bảng đen rồi đặt dưới ngọn đèn điện đang sáng. Chọn từ/cụm từ thích hợp điền vào chỗ trống để hoàn thành câu sau đây: "Trong hiện tượng phản xạ ánh sáng, góc phản xạ là góc tạo bởi giữa phương của tia ... với pháp tuyến của gương tại điểm tới."Trình đọc Chân thực (25 Điểm)
$4x^{2}$+4x-9$y^{2}$+1 Phân tích Ko làm tắt
Cho hình sau mỗi hình vẽ cho 2 cạnh.Hãy tính cạnh còn lại Có thể giúp mik giải câu này đc ko ạ
smile peer yell stroll stare hiss wander rush laugh whisper 25.Rosie’s such a cheerful girl because she always ........... to us. (1 Point) Enter your answer 26.The house seemed empty, but I ………. through the window to see if anybody was there. (1 Point) Enter your answer 27.The children ran away when they heard their mother ……….. (1 Point) Enter your answer 28.I ……….. along the beach with the warm sun on my face. (1 Point) Enter your answer 29.The children …………… at the old lady’s strange hat. (2 Points) Enter your answer 30.The boy …………. a warning to be quiet. (1 Point) Enter your answer 31.For an hour or two, we …………. around the city, totally lost. (1 Point) Enter your answer 32.Try to do your work calmly and carefully, without ………… (2 Points) Enter your answer 33.I always …………….. at Andrew’s silly jokes. (2 Points) Enter your answer 34.The child was ……………… in her mother’s ear so that no one else could hear he
16.No sooner had the rain stopped than the car ______ into a barrier at the corner of the street A.Had crashed B.crashed C.to crash D.crashing 19. Once upon a time, there ____ three brothers in a cottage in the forest. A. live B. lived C. are D. were 21. When you come to the office tomorrow, we ______ letter yet. A. won’t have finished B. will finish C. will be finishing D. finish 22. Don’t_____ such a lie to me. I can’t see you through. A. say B. speak C. talk D. tell 23. When the man comes back home next Friday, his housewife ______ his house for two days. A. will repaint B. will have repainted C. will are repainting D. will paint 24. How long______ you _____married by 2024? For 20 years A. will- have got B. will – get C. will be getting D. did- get 25. By the time they get here, their friends ___________ together by the sea. A. will dance B. will be dancing C. will have danced D. are dancing 26. One disadvantage/ have a car/ that/ it cost/ a lot/ insure A. One disadvantage of having a car is that it costs a lot to insure. B. One disadvantage of having a car is it costs a lot to insure. C. One disadvantage when having a car is it costs a lot to insure. D. One disadvantage of having car is that costs a lot to insure. 27. She/ spend/ free time/ go/ her friends. A. She spends all her free time to go out with her friends. B. She spends all her free time going out with her friends. C. She spends all her free time go visiting her friends. D. She spends all her free time going for with her friends. 28. They are preparing to celebrate the wedding anniversary. A. The wedding anniversary is being prepared to celebrate. B. The wedding anniversary is being prepared to be celebrated. C. They are preparing for the wedding anniversary to be celebrated. D. They are preparing the wedding anniversary for celebrating. 29. “ Would you like a cup of tea?” A. He ordered me to have a cup of tea. B. He asked me if I liked a cup of tea. C. He asked me to make him a cup of tea. D. He offered me a cup of tea. 30.The test is a piece of cake. A. The test is easy. B. The test is difficult. C. The test is boring. D. The test is wonderful.
nhanh giúp em với ạ em cần xong trc 6h
Phân tích đa thức thành nhân tử A) $x^{3}$ -$3x^{2}$ -$4x$-$12$ B) $(x+y+z)^{3}$ -$x^{3}$ -$y^{3}$- $z^{3}$
Tính hóa trị của K trong hợp chất K2CO3 biết CO3: ll
nhanh giúp ạ em cần làm xong trước 6h ạ
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