cho hình thang ABCD (AB//CD) có BD^2=AB.CD. chứng minh đường tròn ngoại tiếp tam giác ABD tiếp xúc với BC

Cho hệ phương trình (I) ((a+1)x-y=3 và ax+y=a. Xác định a để hệ có nghiệm duy nhất thỏa mãn điều kiện x+y lớn hơn 0 Giải giúp mình bài 10 với ạ

X x2,5 + x: 8 + x : 0,2 = 15,25 cách giải

từ nội dung đã học về chủ đề lao động tự giác, năng động và sáng tạo. Hãy cho biết bạn hiểu như thế nào về câu nói sau đây: Cơm ăn một bát sao no Ruộng cày một vụ sao cho đành lòng Sâu cấy lúa, cạn gieo bông Chẳng ươm được đỗ thì trồng ngô khoai.

hai chiếc tàu thủy cùng xuất phát từ vị trí a đi thẳng theo hai hướng tạo với nhau 1 góc 60 độ.Tàu B chạy vs vận tốc 20 hải lí /1h.Tàu C chạy vs vận tốc15 hải lí /1h.Sau 2h hai tàu cách nhau bao nhiêu hải lí?

Một trường mầm non chuẩn bị gạo đủ ăn cho 450 em bé ăn trong 30 ngày. Đến ngày khai giảng có thêm 50 em bé mới đến . Hỏi số gạo trên hết sớm hơn dự định bao nhiêu ngày ?

/x/<3 -5<x<1 (7-x).(x+19)=0 (x-3).(x-5)<0 2x^2-3=29 -12(x-5)+7(3-x)=5 giúp mik vs mn ơiiiiiiiiiii

VII. Read and choose the best answer An artist went to a beautiful part of the country for a holiday, and stayed with a farmer. Every day he went out with his paints and brushes and painted from morning to evening, and then when it got dark, he went back to the farm and had a good dinner before he went to bed. At the end of his holiday he wanted to pay the farmer, but the farmer said, "No, I do not want money but give me one of your pictures. What is money? In a week it will all be finished, but your painting will still be here." The artist was very pleased and thanked the farmer for saying such kind things about his paintings. The farmer smiled and answered, "It is not that. I have a son in London. He wants to become an artist. When he comes here next month, I will show him your picture, and then he will not want to be an artist any more, I think." 1. Where did the artist spend his holiday? A. With his paintsandbrushes B. With farmer C.Onafarm D.In a beautiful part of the country 2. What did he do during his holiday? A. He went out everyday. B. He made paints andbrushes. C. He went back to thefarm. D. He painted all day. 3. What did the farmer ask for at the end of theholiday? A.Apicture B.Hiswage C. manypicture D. money 4. Why was the artist very pleased with the farmer’srequest? A. Because the farmer had thanked him. B. Because he had so many kinds of pictures. C. Because he would sell one of his pictures. D. Because he thought his pictures were sobeautiful. 5. Why did the farmer ask the artist for the picture? A. Because the farmer wanted his son to see the picture. B. Because the artist didn’t want to pay thefarmer. C. Because the farmer wanted to say the kind things about the picture. D. Because the picture was beautiful. VIII. Write full sentences to make a passage, using the suggested words and phrasesgiven 1. Hung King/ Temple/ Festival/ take/ place/ 8th/ 11th/ day/ third/ lunar/ month/PhuTho/./ 2. This/ festival/ hold/ worship/ Hung Kings/ who/ be/ founders/ also/ first/ emperors/ nation/./ 3. The/ festival/ features/ process/ the/ foot/ NghiaLinh/ mountain/ the High Temple/ top mountain/./ 4. Here/, / there/ ceremony/ offer/ incense/ specialty/ such as/ chung cakes/,/ day cakes/ five-fruit trays/Kings/./ 5. Moreover/,/ there/ also/ many/ joy/ activity/ include/ bamboo swings/,/ lion dances/,/ wrestling/ and/ xoan/ sing/performance/./

Bài 2: (2 điểm) Cho phương trình: 2x+k=x-1(*) a) Tìm k để phương trình (*) có nghiệm x=-2. b) Tìm k để phương trình (*) tương đương với phương trình 2x=10.

Giúp mik giải bài toán này nhé mọi người!!!!!!!!!