Cho hình thang ABCD có diện tích 345cm2, đáy nhỏ AB=10cm, đường cao AH=15cm. Lấy điểm M trên BC sao cho BM=MC, lấy điểm N trên đáy DC sao cho CN=2×DN. a) tính độ dài CD, b) tính diện tích tam giác AMN

Cho y = z y x z = 16 Tìm y và z

Cho tam giác ABC cân tại A, kẻ AH vuông góc với BC (H thuộc BC). Gọi N là trung điểm của AC.Chứng minh tam giác ABH= tam giác ACHHai đoạn thẳng BN và AH cắt nhau tại G, trên tia đối của tia NB lấy K sao cho NK=NG. Cmr: AG//CK.Chứng minh G là trung điểm của BK.Gọi M là trung điểm AB. Chứng minh BC+AG>4GM

QUESTIONS 16-20. Complete the conversation between two friends outside a cinema. What does Mary say to Sarah?For questions 16-20, mark the correct letter A-H on the answer sheet. EXAMPLEANSWER Sarah:Hi, Mary. Sorry I’m late. Mary: 0. ___E_____ Sarah:Where’s John? Mary:16. ______________. Sarah:The traffic is very bad. Mary:17. ______________. Sarah:Oh, that’s right. He doesn’t like driving at night. Well, let’s phone him. Have you got his number? Mary:18. ______________. Sarah:Oh dear, that’s a pity. We won`t see the beginning of the film. It starts in five minutes. Mary:9. ______________. Sarah:I’ll see you inside then. Mary:20. ______________. Sarah:Yes, and I’ll get some chocolates too. See you in a minute. A.No, it`s in my diary at work. B.Can you get me an orange juice? C.Yes, I have. I’ll phone him now. D.Why don’t you go in? I’ve got John`s ticket so I`ll wait here. E.Oh, that’s all right. F.If he doesn`t come in five minutes, let’s go in. G.He’s late too. I told him to be here at seven. H.I think he’s coming by train. 

1. " I think you should see a doctor," my friend said to me -> my friend advised................ 2. " I'm sorry I didn'n do my homework," John said to the teacher -> John apologized................. 3. "Let's go out and enjoy a nice wweather," said Rita -> Rita suggested................................ 4. He said to me," Would you like to have a drink with me" -> He invited..................................... 5,"Stop smoking!" the doctor said to him -> the doctor told him...................... mn ơi giúp e vs ạ tý nx e phải đi học r plsssss e cảm ơn trc ạ

các bạn giúp mình nốt phần này nhé

Cho hình thang ABCD , đáy bé AB = 1/3 đáy lớn CD . Nối A với C . Tính diện tích tam giác ADC , biết diện tích hình thang vuông là 20 cm vuông

Mỗi thùng có 6 lít dầu. Hỏi 5 thùng như vậy bao nhiêu lít dầu ?

V. Make future simple question : ( 10 điểm ) 1. ........................................... ( people / live ) on the Moon someday ? 2. What ................................. ( the cars / look ) like in 20 years ? 3. ........................................... ( robots / replace ) humans ? 4. Where .............................. ( you / be ) in 2040 ? 5. When .......................................... ( humans / live ) on other planets ? 6. ..................................................... ( houses / be ) more environmentally friendly in the future ? 7. ..................................................... ( computers / take ) over the world ? 8. How ............................................ ( fashion / change ) ? IX. Complete the sentences with an appropriate preposition : ( 10 điểm ) 1. Cars of the future run .................. electricity. 2. Phong's dream house looks ................... a UFO. 3. We'll live ......................... a hi - tech house ........................... the moon. 4. Robots at home wwill help people ....................... household chores. 5. Will your future house be .......... space ? 6. Will robots take care .................... children ? 7. ....................... the future I will travel to the Moon ....................... super car. 8. We might have flying cars ............................ 2050.

Để thu đc300g dd KOH 20% thì cần bao nhiêu (g) dd KOH 60% x bao nhiêu (g) nước?