Mn giúp mình làm bài 7 cảm ơn mọi người

tim x y e z biet ( x + 3 ) . ( 2y - 1) = 5

10 mũ 10 và 48 .50 mũ 5 câu 2:348 mũ 4 và a mũ 363 cả 2 câu đêug là so sánh nah

Lim căn bậc 3 của 8n^2+n^2 - căn bậc 2 của 4n^2+1

1. Mum ……..all morning. She ...........lots of Christmas presents. A. has shopped - has bought B. has been shopping - has bought C. has been shopping - has been buying D. has shopped - has been buying 2. Kevin ……..his homework, but he …..... it yet. A. has been doing - hasn't been finishing B. has done - hasn't finished C. has been doing - hasn't finished D. has done - hasn't been finishing 3. Pete ……… at Midfield Secondary School since 2006, but he.... music in his lessons twice. A. has been teaching - has only played B. has been teaching - has only been playing C. has taught - has only been playing D. has taught - has only played 4. I .........the biography of Robbie Williams, but I'm on page 50. A. have read B. have been reading C. had read D. was reading 5. Jimmy can go out when he....for the exam. A. has been studying B. has been studied C. has studied D. studied 6. I ….......the latest Harry Potter book all day. I'm dying to know what happens in the end! A. am reading B. have been reading C. have read D. had read 7. So far I ……...any of the exams at school. A. haven't been failing B. hadn't failed C. didn't fail D. haven’t failed 8. We ……..our classroom for the upcoming Teachers' Day, but there's still a lot to do. A. are decorating B. decorated C. have been decorating D. have decorated 9. Margaret ……..in the school marathon for charity before. A. has never run B. never runs C. never ran D. has never been running 10. My brother graduated from Hanoi University of Science and Technology last month and ……...for a job since then. A. has been looking B. has looked C. was looking D. had looked

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Cho 4,2 gam Anken Y tác dụng vừa đủ với dd chứa 16 gam Br2 : a) tìm CTPT , viết ctct và đọc tên Y b) viết pthh xảy ra khi cho Anken Y (dạng CTCT) phản ứng lần lượt với H2,HCL, trùng hợp?

Trong mặt phẳng tọa độ Oxy cho tam giác ABC với A(-1;1) , B(1;3) , C(1;-1). Tìm tọa độ trọng tâm của tam giác ABC. Chứng minh tam giác ABC vuông cân tại A

VIẾT LẠI các câu sử dụng câu ước với wish

Nêu thành phần cấu tạo của tế bào và chức năng Mik cám ơn rất nhiều