Năm nay con 8 tuổi, mẹ 32 tuổi. Hỏi trước đây 2 năm tuổi của mẹ cộng với tuổi của con là bao nhiêu?

giải hệ pt a, x^2y+xy^2=6 và xy+x+y=5 b, x-y+xy=-1 và x^2+y^2-x-y=2

Mng giúp em những câu này ạ. Em đag cần gấp lắm ạ em cảm ơn

Giúp mk vs ạ Lưu ý : Không chép mạng nha Cảm ơn trước ạ

Hai địa điểm A và B cách nhau 120 km. một xe đạp và xe máy khởi hành cùng lúc đi từ A đến B, sau 3 giờ thì khoảng cách giữa hai xe là 30 km. Tính vận tốc hai xe, biết thời gian để đi hết quãng đường AB của xe đạp nhiều hơn xe máy là 2 giờ

Sự đóng và duỗi xoắn của NST có ý nghĩa sinh học như thế nào ?

2x-32=28 =========== bao nhiêu mọi người trình bày nhé🎭

Không cần làm hết đâu =)) 1 ý cũng đc ạ

20. Our new neighbors are quite nice _______ they are sometimes talkative. a. despite b. in spite of the fact c. though d. as though 21._______ of the difficulty, they managed to climb to the top of the mountain. a. In spite b. Despite c. But d. Although 22. Despite _______, we knew that he was guilty. a. denied b. denying c. he denied d. his denial 23. Despite the fact that _______, we enjoyed our trip. a. the weather is bad b. it is a bad weather c. the bad weather d. the weather was bad 24. Julie failed the exam _______ of working very hard. a. despite b. in spite c. even if d. though 25. Tom went to work despite _______. a. that he did not feel very well b. of the fact not feeling well c. he did not feel very well d. not feeling very well 26. _______ his exhaustion, he won the marathon by nearly three minutes. A. In spite B. Despite C. Although D. However 27. ______ the bad weather, the plan landed safely. A. in spite B. in spite of C. despite the fact that D. though 28. _______ it was raining hard, he went out without a raincoat. A. Despite B. In spite of C. However D. Although 29. They were sacked _____ their carelessness. A. because B. because of C. although D. despite 30. Some workers are so poor that they don’t want to quit their job _______ they are ill- treated A. as though B. since C. although D. if

Ex4. Rewrite the following sentences keeping the same meaning. 1. There are many chairs in the kitchen. The kitchen___________________________________________________ 2. Nam lives in the city. Nam doesn’t__________________________________________________ 3. I don’t have a bookshelf in my bedroom. There _______________________________________________________ 4. There are four people in my family: my parents,my brother and me. I live________________________________________________________ 5. We have a fridge, a cooker, a sink and a cupboard in our kitchen. There ________________________________________________________ 6. The television is in front of the picture. The picture is_________________________________________________ 7. My favourite room in the house is the living room. I like _______________________________________________________ 8. I don’t watch TV in any other rooms but the living room. I only_______________________________________________________ 9. The dog is in front of the microwave. The microwave ______________________________________________ 10. The notebook is on the book. The book _________________________________________________ Giúp em bài này vs đang cần gấp ¡