trong v lít không khí có chứa 5.6 lít khí oxi tính khối lượng v

Mn hãy giúp mik bài 1,2,3.4,5 nha. Ai làm xong nhanh nhất sẽ được vote 5*, còn ai làm chậm thì vote 5* luôn nha. Mik cảm ơn mn nhiều nha. 1.Tính: a) -5/12 + 1/-4; b) 5/12 + -3/28; c) -7/15 + 3/35; d) -5/7 + -3/4; e) -24/54 + 35/-126; g) 1/3 + 3/4 + 1/2; h) 1/2 + -7/8 + 5/-4; i) 21/-5 + -13/7 + 23/-35 2.Điền dấu thích hợp (<; >; =) vào chỗ chấm. a) -6/11 + 5/11...... -1 ; b) 2/5..... 3/4 + -1/6 ; c) 5/6 + -2/3..... 1/12 + -4/5 3. Viết phân số 3/4 thành tổng của hai phân số có tử là 1. 4. Một vòi nước chảy vào một cái bể. Giờ thứ nhất vòi nước đó chảy được 2/7 bể, giờ thứ hai vòi đó chảy được 3/7 bể và giờ thứ ba vòi đó chảy được 9/35 bể. Hỏi sau 3 giờ vòi nước đó có chảy được đầy bể không? 5. Cho A = 2011/2012 + 2012/2013; B = 2011 + 2012/2012 + 2013. Trong hai số A và B, số nào lớn hơn?

Giúp hộ mình câu b,c bài 1 với ạ

giải hộ bài này cho em ạ toán khó quá e ko bt làm

Bạn nào giải thích hộ mik mấy bài này vs

[4-5x]=24 với x bé hơn hoặc bằng 0

TÍNH NHANH: a) 4/6-7/13-17/9-14/6 *dấu này / là phần nha.*

Để làm thí nghiệm 19.3 các bình thủy tinh và mực nước trong các bình thủy tinh phải có đặc điểm gì? (sgk vật lý 6/trang 60)

15. The ______________of TuDuc Tomb was completed in 1876. (CONSTRUCT) 16. The chicken meat served with pho ga is ______________and cut into thin slices. (BONE) 17. The students were ________prepared for the national exams. (CARE) 18. He is so clever and well ______________. (EDUCATE) 19. Dong Ho ______________are made in Dong Ho village. (PAINT) 20. The ______________of pho spread southwards in the 1950’s. (POPULAR) 1.The Temple of Literature is one of the best________places in Viet Nam. (CULTURE) 2. Students tried to pass the Royal exams to achieve their________when theystudied in the Temple of Literature. (DOCTOR) 3.Chu Van An was one of the most brilliant and famous_______in Viet Nam's history. (SCHOLAR) 4.He completed his exams________and won a scholarship to study abroad. (SUCCEED) 5.The 's pictures are very beautiful. They are shown in a national exhibition. (PAINT) 6.He is _____ about his sister's performance because she was sick yesterday. (ANXIETY) 7.She is cooking the food ____. It's interesting to see it. (SPECIAL) 8.He took an ____ last week. His result was very good. (EXAM) 9.He received _____as a good teacher after working hard for a long time. (RECOGNIZE) 10.Thong Nhat Palace is a attraction in HCMC. (TOUR) 11. The Temple of Literature is considered one of the most _____historical sites of Viet Nam. (IMPORT) 12. The school is quite normal, but its arereally beautiful. (SURROUND) 13. The students were carefully for the final exam. (PREPARE) 14. Was the of the first Doctors’ Stone Tablet ordered by King Le Thanh Tong? (ERRECT) 15. Many students and teachers have for the development of the school. (CONTRIBUTE) 16. The was a great success and it became famousall over the world. (UNIVERSE) 17. Many and scholars discussed the changeof the curricula. (EDUCATE) 18. The circle and square of the pavilion _______________ the heaven and the earth. (SYMBOL) 19. Tourists like to visit _______________ monuments such as Ho Chi Minh Mausoleum and the Temple of Literature. (HISTORY) 20. King Ly Nhan Tong was the _______________ of the Imperial Academy. (FOUND)

giúp e vs ạ vote cho hết 5 sao ạ giúp e vs