Cho tam giác ABC d thuộc tia đối AB, E thuộc tia đối AC sao cho AD =AC, AE = AB,AH vuông góc BC, AK vuông góc DE chứng minh rằng a) tam giác ABC=tam giác ADE b) BH=EK c)góc HAC=góc DAK

trước đây 4 năm tuổi mẹ gấp 4 lần tuổi con. Sau 4 năm nữa tuổi mẹ gấp 2,5 lần tuổi con. Tính tuổi hiện nay của mỗi người

vẽ anime thở dài nèo '-' full màu +line số cám ơn đẹp : 888 ❤

Giúp mình môn Toán tìm giới hạn số !!!!

Vẽ anime chán nha, đẹp ko đẹp bc nản quá '-'

31. Mert never smoked at all when he was at the university but now he smokes ten cigarettes a day. ________________________________________________________________. 2. Mr.Carlos travelled a lot when he was young but now he writes books for travelers. ________________________________________________________________: 3. Aylin worked here for five years but now she works for an international oil company. ________________________________________________________________. 4. My grandparents told me a lot of interesting things about the Independence War but they can’t do it now because both of them died years ago. _________________________________________________________________: 5. Women didn’t vote in elections in the past but now they have the right to be a member of the parliament. _________________________________________________________________. Bài 2 Viết lại câu, sử dụng used to hoặc didn't use to 1. I had a lot of money but I lost it all when my business failed.=> I used to have a lot of money 2. I quite like classical music now, although I wasn't keen on it when I was younger. =>I didn’t use to like classical music 3. I seem have lost interest in my work. =>I used to have interest in my work 4. My brother had his hair cut short when he joined the army. =>My brother used to have long hair. 5. Dennis gave up smoking three years ago. =>Dennis used to smoke three years ago 6. My parents lived in the USA when they were young. => My parents used to live in the USA when they were young 7. Jim was my best friend, but we aren't friends any more. =>Jim used to be my best friend. 8. When he was younger, my uncle was a national swimming champion. =>my uncle used to be a national swimming champion. 9. I eat ice-cream now, but I disliked eating it when I was a child. => I didn’t use to eat ice-cream when I was a child. I get used to eating ice-cream now / I used to dislike eating ice-cream when i was a child Viết lại câu, sử dụng used to hoặc didn't use to 1. I had a lot of money but I lost it all when my business failed.=> I used to have a lot of money 2. I quite like classical music now, although I wasn't keen on it when I was younger. =>I didn’t use to like classical music 3. I seem have lost interest in my work. =>I used to have interest in my work 4. My brother had his hair cut short when he joined the army. =>My brother used to have long hair. 5. Dennis gave up smoking three years ago. =>Dennis used to smoke three years ago 6. My parents lived in the USA when they were young. => My parents used to live in the USA when they were young 7. Jim was my best friend, but we aren't friends any more. =>Jim used to be my best friend. 8. When he was younger, my uncle was a national swimming champion. =>my uncle used to be a national swimming champion. 9. I eat ice-cream now, but I disliked eating it when I was a child. => I didn’t use to eat ice-cream when I was a child. I get used to eating ice-cream now / I used to dislike eating ice-cream when i was a child 1. When I was a child, I used to dream (dream) of being an astronaut. 2. I'm terribly nervous. I'm not used to speaking (speak) to a large audience. 3. It took us ages to get used to living (live) in an apartment house. 4. Lots of trains used to stop (stop) here, but not many do now. 5. Didn't Nick use to work (work) on a building site? 6. I'll have an orange juice, please. I'm not used drinking (drink) alcohol. 7. David doesn't seem to mind being in hospital. I suppose he's got used to being (be) there. 8. When Laura was at college, she used to have (have) a picture of Elvis Presley on her bedroom wall. 9. There used to be (be) a cinema here but it was knocked down a few years ago. 10. When she arrived in Britain, she wasn't used driving (drive) on the left, but she soon got used to it. Bài 2 Viết lại câu, sử dụng used to hoặc didn't use to 1. I had a lot of money but I lost it all when my business failed. => I used to have a lot of money 2. I quite like classical music now, although I wasn't keen on it when I was younger. => I am used to liking classical music. 3. I seem to have lost interest in my work. => I used to have interest in my work 4. My brother had his hair cut short when he joined the army. => My brother used to have long hair 5. Dennis gave up smoking three years ago. => Dennis used to smoke 3 years ago 6. My parents lived in the USA when they were young. => My parents used to live in the USA when they were young 7. Jim was my best friend, but we aren't friends any more. => Jim used to be my best friend 8. When he was younger, my uncle was a national swimming champion. => My uncle used to be a national swimming champion when he was young 9. I eat ice-cream now, but I disliked eating it when I was a child. => I get used to eating ice-cream now / I used to dislike eating

giải hpt x +x+y/y=1/2 y +x+y/y=5/2

1. E = 1/2 + 2/2^2 + 3/2^3 +..........+ 60/2^60 < 2 2. F = 1/3 + 2/3^2 + 3/3^3 +...........+ 70/3^70 < 3/4 Moi người giúp mik tối 6h mik đi học rồi !!!

Trả lời giúp mik nhé đang cần gấp

Thời gian làm một bài toán (tính bằng phút) của 20 học sinh được ghi trong bảng sau: 6 7 4 6 8 8 7 11 10 10 5 7 3 7 6 9 9 7 12 9 a) Dấu hiệu cần tìm hiểu ở đây là gì và số các giá trị là bao nhiêu? b) Lập bảng tần số và tính số trung bình cộng của dấu hiệu. c) Biểu diễn bằng biểu đồ đoạn thẳng.