Một chiếc xe đi từ A đến B mất 1 khoảng thời gian t với tốc độ trung bình là 48km/h.Trong 1/4h đầu chạy vs vận tốc trung bình là 30km/h.Trong khoảng thời gian còn lại nó chạy với vận tốc trung bình là: A.56km/h B.50km/h C.53km/h D.54km/h Giải thích luôn giúp mình vs ạ Hứa vote 5s và ctlhn ạ

các bn làm hộ mik bài này nhá mik sẽ vote 5sao + cảm ơn +câu trả lời hay nhất

tính số lượng H2O cần thêm vào 100g dung dịch H2SO4 9,85 để thu được dung dịch có nồng độ 4,9% giúp mik vs đang cần gấp 5 sao và câu tlhn

Nêu các biện pháp để hoàn thành mục tiêu học tập.

Giải phương trình B= $\frac{yz}{(x-y)(x-z)}+$ $\frac{xz}{(y-x)(y-z)}+$ $\frac{xy}{(z-x)(z-y)}$

126. I haven’t seen that man here before. A. It’s the first time I’ve seen that man here. B. It’s the first time I saw that man here. C. It’s the first time I had seen that man here. D. It’s the first time I see that man here. 127. The furniture was so expensive that I didn’t buy it. A. The furniture was too expensive for me to buy it. B. The furniture was too expensive for I to buy. C. The furniture was too expensive for me to buy. D. The furniture was too expensive with me to buy. 128. They’ll have to change the date of the meeting again. A. The date of the meeting will have to been changed again. B. The date of the meeting will have to be changed again. C. The date of the meeting will have to be change again. D. The date of the meeting will had to be changed again. 129. The bus takes longer than the train. A. The train doesn’t take as long so the bus. B. The train doesn’t take as long as the bus. C. The train doesn’t takes as long as the bus. D. The train doesn’t take as longer as the bus. 130. It is unnecessary to change your dress. A. You needn’t to change your dress. B. You needn’t changed your dress. C. You needn’t change your dress. D. You needn’t changing your dress. 131. We couldn’t drive because of the fog. A. The fog prevented us for driving. B. The fog prevented us with driving. C. The fog prevented us from driving. D. The fog prevented us in driving. 132. Did anything disturb you in the night? A. Were you disturbed (by anything) in the night? B. Were you disturbing (by anything) in the night? C. Were you being disturb (by anything) in the night? D. Were you being disturbing (by anything) in the night? 133. I would like you to help me to put the chairs away. A. Do you mind help me to put the chairs away? B. Do you mind helping me to put the chairs away? C. Do you mind to help me to put the chairs away? D. Do you mind with helping me to put the chairs away? 134. Although both his legs were broken in the crash, he managed to get out of the car before it exploded. A. Despite of his broken legs in the crash, he managed to get out of the car before it exploded B. Despite that his broken legs in the crash, he managed to get out of the car before it exploded C. Despite his broken legs in the crash, he managed to get out of the car before it exploded D. Despite his legs were broken in the crash, he managed to get out of the car before it exploded 135. After fighting the fire for twelve hours the firemen succeeded in putting it out. A. The firemen managed to put out the fire after fight it for twelve hours. B. The firemen managed to put out the fire after being fighting it for twelve hours. C. The firemen managed to put out the fire after to fight it for twelve hours. D. The firemen managed to put out the fire after fighting it for twelve hours. 136. You can’t visit the United States unless you get a visa. A. If you don’t get / haven’t (got) a visa, you can’t to visit the United States. B. If you don’t get / haven’t (got) a visa, you can’t visit the United States. C. If you get / have (got) a visa, you can’t to visit the United States. D. If you get / have (got) a visa, you can’t visit the United States. 137. He could not afford to buy the car. A. The car was too expensive for him to buy / cost more than he could afford it. B. The car was too expensive for him to buy / cost more as he could afford it. C. The car was so expensive for him to buy / cost more than he could afford it. D. The car was so expensive for him buy / cost more than he could afford it. 138. He is said to have been in the French Foreign Legion. A. People say (that) he have been in the French Foreign Legion B. People says (that) he has been in the French Foreign Legion C. People say (that) he has in the French Foreign Legion D. People say (that) he has been in the French Foreign Legion 139. I advise you to put your money in the bank. A. You’d better to put your money in the bank. B. You’d better put your money in the bank. C. You’d better putting your money in the bank. D. You’d better put your money on the bank. 140. That restaurant is so dirty that no one wants to eat there. A. It is such dirty restaurant that no one wants to eat there. B. It is such an dirty restaurant that no one want to eat there. C. It is such a dirty restaurant that no one wants to eat there. D. It is such a dirty restaurant that no one want to eat there. 141. Unless someone has a key, we can’t get into the house. A. We can only get into the house if someone have a key. B. We can only get on the house unless someone has a key. C. We can only get into the house if someone has a key. D. We can only get into the house unless someone has a key.

Ở một loài thực vật alen A quy định thân cao trội hoàn toàn so với alen a quy định thân thấp, alen B quy định hoa màu trắng. Cho các cây thân cao-hoa màu đỏ, tự thụ phấn, thu được F1 gồm 765 thân cao-hoa màu đỏ, 15 thân thấp- hoa màu trắng ,15 cây thân thấp -hoa màu trắng . Biện luận và viết sơ đồ lai cho kết quả trên.Biết các gen phân li độc lập ,không có đột biến xảy ra và các cây gồm có 2 kiểu gen khác nhau về các tính trạng xét. giải giúp em bài này với ạ! Tí nữa em phải nạp bài online rồi mong mn giúp em hứa vote 5 sao =)))

Mn cho mik hỏi cặp tính trạng THUẦN CHỦND LÀ GÌ VẬY .CHO MIK VD NỮA ❤️

Lúc 8 hai ô tô cùng khởi hành từ hai địa điểm A và B cách nhau 96 km và chuyển động đều ngược chiều nhau tốc độ của xe đi từA 36 km/h về xe đi từ B Là 28 km/ h a) lập phương trình chuyển động của hai xe trên một trục tọa độ b) xác định vị trí Tìm vị trí và thời điểm lúc 2 xe gặp nhau bằng cách vẽ đồ thị tọa độ thời gian c) Tìm vị trí và khoảng cách của hai xe lúc 9 giờ

(2x^2-2x+1).(x^2-5)-(x^2-x).(2x^2-x-10=5