cho hình thang ABCD có góc B =góc C=90độ. Hai đường chéo vuông góc với nhau tại H.Biết rằng AB=3căn5 , AH=3cm.Chứng minh rằng: a)HA:HB:HC:HD=1:2:4:8 b)1/ABmũ2 - 1/CDmũ2 =1/HBmũ2 - 1/HCmũ2 giúp mình với ạ huhu

Giúp e, e ko chắc có phải toán ko nhưng mà e thấy nó giống tính lắm

Các bạn tìm giúp mik đề kiểm tr 15 phút môn Tiếng Anh, lớp 6, Kết nối tri thức với cuộc sống tập 1 theo ma trận này nha.

A- Put the verbs in the correct tense: past simple or past Continuous. 1. It ____________(rain) when I got up. 2. When Mathew arrived, we ____________(have) dinner. 3. She heard him because he ____________(talk) loudly. 4. The taxi ____________(stop) when the train left. 5. He saw her when she ____________(stand) on the terrace. 6. The child fell asleep when I ____________ (watch) TV. 7. When they ____________(get) married, I ____________ (be) on holiday in France. 8. While my mother ____________(garden), my father ____________(do) the washing up. 9. ____________(There to be) a bell at 8.15 and the classes ____________(start) immediately. 10. When I saw Jim at the disco, he ____________(talk) to the DJ. 11. We ____________(go) swimming in the sea because the weather ____________(be) fine. 12. They ____________(have) a good time when the disaster ____________(happen) 13. He ____________(buy) some greeting cards when I ____________ (meet) him at Harrods. 14. When the alarm____________(ring), he ____________(have) a drink in the bar. 15. Robert ____________(ski) down a mountain when he____________(fall).

19. Mr. Pike said to me. “ I need you to help me with this work tonight.” …………………………………………………………………………………………… 20. Helen asked the child :  “Are you going to visit your uncle tomorrow ?” …………………………………………………………………………………………… 21. She asked her friend :  “Do you go to school by bike today ?” …………………………………………………………………………………………… 22. The man said to his daughter : “ Did you feel sick yesterday ?” …………………………………………………………………………………………… 23. Paul asked his mother: “Shall I put this wardrobe here ?” …………………………………………………………………………………………… 24. “ Can you lend me some money to buy this book, please Nam ?”. Uyen asked. …………………………………………………………………………………………… 25. “ Will you be ready to start the course tonight ?”. She asked us. …………………………………………………………………………………………… 26.  John said to Mary:  “ I will give you a new bike next summer.”    John told ………………………………………………………………………………. 27. “I’m looking for the book you gave me last week ” .Mary said to Peter.   Mary told Peter ……………………………………………………………………… 28. Tom said: “I must leave now.”   Tom  ………………………………………………………………………………

Sử dụng các từ trong ngoặc để viết lại những câu sau sao cho nghĩa không đổi. (có những mình câu mình làm rồi) 1. You should see a dentist about that toothache. (advise) I _______________________________________________________ about that toothache. 2. She took a painkiller in order to ease her headache. (design) She took a painkiller ___________________________________________ her headache. 3. Many people find it hard to give up smoking. (difficulty) Many people ____________________________________________________ smoking. 4. I am weak and tired. I can’t go out tonight. (too) I am _____________________________________________________________ tonight. 5. He is too short to reach the ceiling. (enough) He is not tall enough to reach the ceiling. 6. She is feeling not very well today. (under) She is feeling under the weather today. 7. Children should take part in outdoor activities to develop their social skills. (go) Children should ____________________________ outdoor activities to develop their social skills. 8. My brother is really healthy. (fiddle) My brother is _______________________________________

Giải phương trình sau Ảnh bên dưới

Giúp em với ạ trong 5-10p với ạ. Em cần gấp

Cho a + b = 5, ab = −5. Tính giá trị của biểu thức P = $(a − b)^{2}$ + $(a + 1)^{2}$ + $(b + 1)^{2}$

Giải giúp mik với cảm ơn trước ạ