Bài 1: Thực hiện phép tính bằng cách hợp lý nếu có thể: 1) 4/13 + (-13/5) + 9/13 + 3/5 2) 7/5 + (-4/3)*2/5 - (-4)/3*19/5 3) -5/9*5/17 + (-5)/9*12/17-4/9 4) 0,75*2020^0 - (9/2 -50%) : 2/3 5) 3/9 - (-5/6 + 4/12) - 17/6 6) (-2 + 2/3 - 2/5) + (1-5/3 - 3/5) 7) -8/13 * 3/7 + 8/13 * (-2)/7 - (-8)/13 * 12/7 8) 2/5 + 3/5 * ( -2 + 1/2 + 1 + 1/2) ( Những số mik in đậm là phân số nha; * là dấu nhân: ^ là mũ)
Giúp mình vs. Mình sẽ vote 5 sao. Mình thực sự cần gấp😭😭😭😭😭😭😭😭😭😭
Các bạn ơi giúp mk với mk sẽ vote cho 5 sao Bài Một máy tănh thế gồm cuộn sơ cấp có 300 vòng cuộn thứ cấp có 30.000 vòng đặt vào giữa ,hai đầu cuộn sơ cấp là 1000V ,công xuất điện tải đi là 500.000W a,Tính hiệu điện thế giữa 2 đầu cuộn thứ cấp? b,Tính công xuất hao phí trên đường dây tải?
Một thùng tôn dạng hình hộp chữ nhật không có nắp, có chiều dài 12 dm, chiều rộng 5 dm, chiều cao 7dm. Hãy tính diện tích tôn để làm thùng. giúp mik nha mọi người !
Giúp mình với ạ mình đang cần gấp
Vẽ giúp mình Ran và Shinichi nhaaaa Vẽ đẹp sẽ vote 5*
Quốc gia độc lập nhỏ nhất thế giới, SỐ dân?
Hoàn thành phản ứng theo sơ đồ: butan---> metan--> axetilen-->vinyl clorua-->PVC.
VI. Choose the best answer (A, B, C or D) that is the same meaning with the italic sentence. Question 31. Alexander Graham Bell invented the telephone in 1876. A. The telephone is invented by Alexander Graham Bell in 1876. B. The telephone was invented by Alexander Graham Bell in 1876. C. The telephone in 1876 were invented by Alexander Graham Bell. D. The telephone will be invented by Alexander Graham Bell in 1876. Question 32. We are interested in protecting environment. Our teacher is pleased. A. Our teacher is pleased that we are interested in protecting environment. B. We are interested in protecting environment that our teacher is pleased. C. Our teacher is pleased to protect environment. D. Our teacher is pleased to be interested in protecting environment. Question 33. My father bought this house 2 years ago. A. This house was bought by my father 2 years ago. B. This house bought by my father 2 years ago. C. This house were bought 2 years ago. D. This house 2 years ago is bought by my father. Question 34. The car is very beautiful. It is made in Japan. A. The car is very beautiful made in Japan. B. The car made in Japan is very beautiful. C. The car making in Japan is very beautiful. D. The car is made beautiful in Japan. Question 35. Viet Nam is a country which exports a lot of rice. A. Viet Nam is a rice –exporting country. B. Viet Nan is an exporting –rice country. C. Viet Nam is a rice –exported country. D. Viet Nam is a country exporting - rice. Question 36. It’s two years since I last visited China. A. I haven’t visited China since two years. B. I haven’t visited China for two years. C. I have visited China since two years. D. I have visited China for two years. Question 37. He started living in Paris in 1990. A. He has started living in Paris since 1990. B. He has lived in Paris for 1990. C. He has been living in Paris for 1990. D. He has lived in Paris since 1990. Question 38. He isn’t strong enough to lift that box. A. He is too weak to lift that box. B. He is weak enough to lift that box. C. He is enough strong to lift that box. D. He isn’t too weak to lift that box. Question 39. I have never been to London before. A. This is the first time I have been to London. B. This if the first time I had been to London. C. It is the first time I have been to London. D. Both A and C are correct. Question 40. Although he is poor, he lives a happy life. A. Despite his poor, he lives a hppay life. B. Despite of his poverty, he lives a happy life. C. Despite being poor, he lives a happy live. D. Both A and C are correct.
Một gia đình cần làm 1 ngôi nhà, họ cần thêm 740 kg vôi tôi nữa để hoàn thiện. Hỏi: a. Họ cần phải mua bao nhiêu kg vôi sống ? b. Họ phải có bao nhiêu lít nước để tôi vừa đủ lượng vôi sống trên ? ( Biết khối lượng riêng của nước là 1kg/l ) Hướng dẫn: áp dụng phương pháp giải BT tính theo PTHH, nên tính theo tỷ lệ về khối lượng: PTHH: CaO + H2O Ca(OH)2 Tỷ lệ klg: 56g 18g 74g x kg y kg 740 kg Giúp mình nhanh nhé Cảm ơn
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