giải hệ phương trình: $\left \{ {{\frac{2}{2x-y} + \frac{3}{x-2y}=\frac{1}{2}} \atop {\frac{2}{2x-y} - \frac{1}{x-2y}=\frac{1}{18}}} \right.$

20ml nước tác dụng với 300ml rượu 80 đọ. Thu được rượu bao nhiêu độ

Exercise 1: Complete the following sentences with the correct form of the verbs in brackets. 1. I (not be) ___________________ very happy yesterday. 2. The people in the café (not be) ___________________ friendly when I was there yesterday. 3. I (leave) ___________________ my school bag at school this morning. 4. It (be) ___________________ a great film in 2001. 5. Our teacher (tell) ___________________ us to be quiet yesterday. 6. I went to the shop but I (not have) ___________________ any money. 7. Susan (not know) ____________about the exam and she did verybadly. 8. I (buy) ___________________ a ticket for the football match yesterday 10. (You/ watch)______________ the tennis match on TV last night? 11. Quang (not play)_________________ any sports last year. 12. My father (take)_______________ me to the gym 2 days ago. 13. What(you/ do)___________________last weekend? - I(visit) _________________ my grandmother. 14. We (play/not)_____________games last year.

Kể tên các loại thân biến dạng ? mỗi loại cho 2 ví dụ

1/I dont like doing the washing up.....do I A.either B.so C.neither D.as 2/When my grandmother was alive,she took.....for running the house. A.responsibly B.responsibility C.responsible D.ability 3/london....an underground train system since the nineteenth century. A.have had B.has had C.had had D.had 4/Pad: Would you đike something to eat? Kathy ".....,I am not hungry now. A.yes,it is B.no,thanks C.yes i would D.no ,no problem

x ² - ( 6 ²-( 8 ² - 9.7) ³ - 7.5) ³ = 118 - 102

Các bạn giúp mình câu 20 với ạ Mình sẽ vote 5* cho các bạn

Read the text then do then task below

Giúp mik bài này với mọi người ơi

 Bài 2 : Đem đốt cháy hoàn toàn 0,1 mol hỗn hợp X gồm 2 anken là đồng đẳng kế tiếp nhau thu được CO2 và H2O có khối lượng hơn kém nhau 6,76 gam. a,Tính phần trăm khối lượng mỗi anken trong hỗn hợp X.