cho tam giác abc có a=90 độ, đường cao AH, biết AB =8cm, BC=10cm, tính độ dài các đoạn AC,HB,HC nhanhcho e với ạ

giúp mik với ạ x=3y=2z và 2x+3y+4z=48

Giúp em với Càng nhanh càng tốt Cảm ơn rất nhiều

Cho tam giác ABC vuông tại A ,đường cao AH.Biết AB=15cm,AC=20cm.Tính AH,BH,CH

Calli:Gấu NL:Ai thích Hero Team khum ọ? ỌvỌ

21.Why don’t we ________ to the dance competition? A. go B. going C. to going D. to go 22.What time does it ________? A. opens B. starting C. closes D. start 23.The art exhibition ________ at 9 a.m. A. start B. finishes C. closes D. open 24.What time ________ the quiz show start? A. is B. am C. do D. does 25.The pottery class ________ at 8 p.m. A. opens B. finishes C. close D. start 26.The dance competition is ________ Sunday. A. in B. on C. at D. up 27.I’m sorry, I can’t because my class doesn’t finish ________ 4 p.m. A. in B. on C. to D. until 28.Would you like ________ to dance class? A. going B. go C. to go D. goes 29.When ________ it? A. do B. is C. does D. are 30.Why don’t we go to the carnival ________ the morning? A. in B. on C. at D. until II. Wordform: 1. I enjoy going ______________ (jog) 2. She wants to try rock ______________ in the mountain. (climb) 3. My mother enjoys ______________ in the morning. (cook) 4. My favorite activity is scuba ______________. (dive) 5. Soccer is one of ______________ activities around the world. (popularity) 6. She is an effective ______________. (act) 7. There are a lot of ______________ in my free time. (act) 8. My brother is an ______________ student in the school. (act) 9. Why don’t we go to the dance ______________ .(competitive) 10.Rock climbing is one of ______________ sports. (extremely) 11.I have to join in pottery ______________. (exhibit) 12.I enjoy walking a ______________ show on TV. (fashion) 13.These clothes look modern and ______________. (fashion) 14.I think art club sounds ______________. (interest) 15.They will find out some ______________ in the book. (inform) 16.Let’s meet in front of the ______________ park at 7 a.m. (amuse) 17.She sent to me her birthday’s ______________ card. (invite) 18.He helps his mom ______________ all old clothes. (collection) 19.She has a stamp ______________. (collect) 20.She works at a ______________ local market. (near) 21.Let’s go to the art ______________ in the city center this weekend. (exhibit) 22.We can buy Tuoi tre newspaper every day. Because it is a _____________ newspaper. (day) 23.My uncle has lot of watches. He has a watch ______________. (collect) 24. ______________ it rained hard, so the soccer match had to stop. (luck) 25.I suggest going mountain ______________ this vacation. (bike) 26.My father ______________ the colorful fish in the tank every day. (food) 27.That man is a stamp ______________. He has a lot of old and new stamps. (collect) 28.There are ______________ flights from HCM city to Ha Noi. (day) 29.It was ______________ believed that every strange old woman is a witch. (popular) 30.What’s your favorite ______________? (act)

:))))))))))))))))))))))))))))))))))))))))))))

Giúp mình với ạ Trình bày đặc điểm khí hậu của châu phi để giải thích vì sao châu phi được gọi là châu lục nóng nhất thế giới

Điền từ 1: It's no use........to be interested in the book

4. Tính thể tích ở (đktc) của: a) 0,5 mol khí O2 b) 0,2 mol khí CO2 c) 16 gam khí O2 d) 32 gam khí SO2 e) 5 mol khí hiđro f) 12 gam khí SO3 g) 0,0015 mol khí H2S 5. Em hãy tìm khối lượng của: a) 1 mol nguyên tử Cl và 1 mol phân tử Cl2 b) 1 mol nguyên tử Cu và 1 mol phân tử CuO c) 1 mol nguyên tử C, 1 mol phân tử CO, 1 mol phân tử CO2 d) 1 mol phân tử NaCl, 1 mol phân tử C12H22O11 (đường)