có hai vòi nước chảy vào bể không có nước. Vòi thứ nhất chảy một mình thì đầy bể trong 3 giờ, vòi thứ hai chảy một mình thì đầy bể trong 5 giờ. Hỏi cả hai vòi cùng chảy thì trong bao lâu đầy bể nước?

21. “Remember to give Alan the card,” Mary shouted at me. Mary reminded _______________________________________________. 22.Our teacher never let us leave the school.  We were _______________________________________________. 23. I told them not to cross the park at night.  I warned _______________________________________________. 24. I have no memory of my first day at school.  I don’t _______________________________________________. 25. I don’t want to go out tonight. I don’t feel _______________________________________________. 26. You will see better results if you study harder, Peter.  Peter’s mother _______________________________________________. 27. “Ok, I can see you at six tomorrow evening” My boss said. My boss agreed _______________________________________________. 28. “Why don’t you listen to recording of different English accents? He _______________________________________________. 29. “Would you like to come to my party tomorrow?” Nam invited me Nam invited _______________________________________________. 30. I would rather you didn’t smoke in my house. . Would you mind _______________________________________________?

Tứ giác ABCD nội tiếp đường tròn (O) đường kính AD = 4cm . Cho AB = BC = 1cm . Khi đó CD bằng

Giúp mk với! (UNIT 12) VOTE 5* PLSSS!!

giải thích cách chia 7 quả táo đều cho 8 người: nhanh: 5 sao đúng: ctlhn sai: 4 sao trả lời linh tinh: 1 sao

giúp mình phần b, c ạ làm nguyên phần c cũng được

sưu tầm một số câu tục ngữ có nội dung phản ánh kinh nghiệm của nhân dân ta về các hiện tượng mưa ; nắng ; bảo ; lụt càng nhiều càng tốt nha

21. “Remember to give Alan the card,” Mary shouted at me. Mary reminded _______________________________________________. 22.Our teacher never let us leave the school.  We were _______________________________________________. 23. I told them not to cross the park at night.  I warned _______________________________________________. 24. I have no memory of my first day at school.  I don’t _______________________________________________. 25. I don’t want to go out tonight. I don’t feel _______________________________________________. 26. You will see better results if you study harder, Peter.  Peter’s mother _______________________________________________. 27. “Ok, I can see you at six tomorrow evening” My boss said. My boss agreed _______________________________________________. 28. “Why don’t you listen to recording of different English accents? He _______________________________________________. 29. “Would you like to come to my party tomorrow?” Nam invited me Nam invited _______________________________________________. 30. I would rather you didn’t smoke in my house. . Would you mind _______________________________________________?

Giúp em với ạaaaaaaaaaaaaaaaaaaaaaaaaaa

Rút gọn giúp mình câu này với ạ, mình cảm ơn ạ !!!