Có 5 lọ mất nhãn, mỗi lọ đựng riêng rẽ 1 trong các dung dịch không màu sau: HCl, NaOH, Ba(OH)2, MgCl2, MgSO4. Chỉ dùng thêm phenolphtalein làm thuốc thử, hãy nhận biết 5 lọ trên bằng phương pháp hóa học.

Mn ơi giải hộ em bài 3 so sánh 2 câu em đánh dấu ạ

Why do americans call autumn ''fall''

Có một bài mà nhìn dài vậy đó Cố giúp tớ nha

cho hình bình hành ABCD. Trên Đường chéo BD lấy các điểm EF sao cho DE = BF. CM AF // CE

***Read the following pasage and chooseA,B,C orD to fill in the gaps: Earnest Hemingway was born in Oak park, a small twon in the state of Illinois. As a boy he was often taken on frequently hunting and fishing trips by hia father to Michigan, the locale of many his stories, and that he soon got acquanited with the life of the Indians and such virtues as courage and endurance,(1) were later revealed in his fiction. After school Hemingway(2) as a newspaper reporter and then joined a volunteer ambulance unit(3) in World War I. After the war he came home(4) a hero. He lived for several years in Paris after that. He joined a group of expatriated American writers who considered(5) a lost generation. In Paris he published "Tree Stories and Ten Poems" (1923) and "In Our Time" (19240 (6) his own experiences of life are revealed, and which brought him (7) immediately. (1) A.That B. which C. who D. it (2)A.works B.was working C. has worked D.worked (3)A.taking part B.take part C.to take part D.took part (4)A.an B.like C.as D.the (5)A.They B.them C.their D.themselves (6)A.in which B.in that C.where D.at which (7)A.famous B.fame C.famed D.famously

Cứu e với ạ gấp :( chuyên gia, hsg

Năm 1976 Đông nam á diễn ra sự kiện quan trọng gì

1 cho A=5x4 ^15 x 9^9= 4 x3^20 x8^9 / B= 5x2^9 x 6^9 - 7 x 2^29 x 27^6 / tích A và B

12.39+39.19+31.61 giải hộ mình ..............