căn (-$x^{2}$ +2x - 1 )xác định khi và chỉ khi

Một ca nô chạy trên 1 khúc sông từ bến A đến bến B. Khi xuôi dòng thì mất 5 giờ, khi ngược dòng thì mất 6 giờ. Tính khoảng cách từ bến A đến bến B, biết vận tốc của ca nô khi xuôi dòng hơn vận tốc của ca nô khi ngược dòng là 6km/giờ

Dịch qua tiếng anh giúp mk nha mn🥳

It is always a wonderful experience to see another species(0) its own environment. This is all the more exciting (13) ........ that environment is under the sea. The UK is home to half the world’s population of grey seals and (14) ........ are many local boat trips offering sightseeing tours out to the islands and sandbanks (15) the animals can most easily (16) seen. But if you really want to get close (17) ........ the seals and understand something about (18) ........ way of life, then you need to go on an underwater seal-watching trip. On these trips, you have the chance to go over the side of the boat and, equipped (19) wetsuit, mask and snorkel, spend time in the water alongside the seals. Seals are extremely inquisitive creatures and, once you’re in the water, they will swim past you trying to work (20) ........ who you are and (21) ........ you’re doing there. (22) ........ they can appear shy at first, seals soon (23) used to you being in the water, and will come and play around you. Young pups especially like to (24) ........ contact with divers, and often use their teeth, gently biting masks, fins and cameras out of curiosity. It can be a thrilling experience. It is always a wonderful experience to see another species(0) its own environment. This is all the more exciting (13) ........ that environment is under the sea. The UK is home to half the world’s population of grey seals and (14) ........ are many local boat trips offering sightseeing tours out to the islands and sandbanks (15) the animals can most easily (16) seen. But if you really want to get close (17) ........ the seals and understand something about (18) ........ way of life, then you need to go on an underwater seal-watching trip. On these trips, you have the chance to go over the side of the boat and, equipped (19) wetsuit, mask and snorkel, spend time in the water alongside the seals. Seals are extremely inquisitive creatures and, once you’re in the water, they will swim past you trying to work (20) ........ who you are and (21) ........ you’re doing there. (22) ........ they can appear shy at first, seals soon (23) used to you being in the water, and will come and play around you. Young pups especially like to (24) ........ contact with divers, and often use their teeth, gently biting masks, fins and cameras out of curiosity. It can be a thrilling experience.

A rút gọn p B tìm x để p > -1 2

Các bạn giải giúp mình với mình cần gấp

Oxi hóa hoàn toàn 1.08g kim loại A (chưa biết hóa trị) cần dùng vừa đủ 0.672l khí oxi đktc được một oxit. Tìm công thức oxit ấy

Tiếng anh 6 HTĐ HTTD HTHT QKĐ TLĐ

Các bạn cho mik hỏi dấu này là j v

7. Cho góc xOy là góc vuông. Trên Ox, Oy lấy A, B sao cho OA = OB = 4 cm. Trên tia đối của Ox lấy điểm C sao cho OC = 4cm; trên tia đối của Oy lấy điểm D sao cho OD = 4 cm. Nối 4 điểm A, B, C, D với nhau. a) Tính AC, BD. b) Chứng tỏ O là trung điểm của AC và BD. c) Kể tên tất cả các đoạn thẳng trên hình vẽ.