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Viết phương trình hóa học (nếu có) khi cho:Na2O, Ca(OH)2 , Fe2O3 , HCL , MgO ,H2O ,SO3 ,CO2 ,K2O ,KOH.Tác dụng với a/BaO b/SO3

giai cac phuong trinh sau: x^2-x=-1 x^2-x=1 x^2-x=-2

một ca nô xuôi 1 khúc sông hết 4h và ngược khúc sông đó hết 6h tính chiều dài khúc sông biết vận tốc dòng nước là 2,5 km/h

cho tam giác abc cân tại a. 2 đường cao bd,ce cắt nhau tại i tia ai cắt bc tại m. cmr m là trung điểm bc, tam giác med cân

Choose the sentence that has the same meaning to the original one 1. She didn't do her homework and was punished. A. If she did her homework, she wouldn't have been punished. B. If she had done her homework, she wouldn't be punished. C. Had she done her homework, she wouldn't have been punished. D. Even if she had done her homework, she would have been punished. 2.Jack didn't leave the shop before his mother bought him a toy car. A. Jack left the shop and his mother bought him a toy car. B. Not until Jack’s mother bought him a toy car did he leave the shop. C. Not until Jack’s mother bought him a toy car did he left the shop. D. Not until Jack’s mother bought him a toy car he left the shop. 3.Despite his early retirement, he found no peace in life. A. Although he retired early, but he found no peace in life. B. His early retirement has brought him peace in life. C. He found no peace in life because he retired early. D. Early as he retired, he found no peace in life. 4.The customer didn't leave the shop before the shopkeeper apologized her. A. The customer left the shop and the shopkeeper apologized to her. B. Not until the shopkeeper apologized to her did the customer leave the shop. C. Not until the shopkeeper apologized to her did the customer left the shop. D. Not until the shopkeeper apologized to her the customer left the shop. 5.It was floody , but they didn’t cancel their trip . A. Though it was floody, they didn’t cancel their trip. B. Their trip wouldn’t be cancelled until it was floody . C. In spite of floody, their trip still went ahead. D. They put off their trip until after the flood .

viết 1 đoạn văn về môn thể thao mà em yêu thích nhất? No copy

mn giúp mình với ạ lm giúp mình bài văn về ngôi trường mơ ước bằng tiếng anh nha mn^^

2,cho tam giác abc có góc c=60 độ và trung tuyến ae=bf.cmr tam giác abc đều

I/ hope/ the future/ he/ teach/ me/ how/ do/ eggshell carving. -..............................................................................................................