Tìm các số nguyên n sao cho 5n+1=n-2

Quangcuong giúp mk với cho hỗn hợp X gồm Fe2O3 và CuO( trong đó Fe2O3 chiếm 80% theo khối lượng) . Hòa tan m g X vào bình chứa 140 ml dd HCl 1M, thu đc dd Y a/ tính m? b/ tính C% các chất trong dd Y? biết DHCl= 1,2g/l

Thuyết minh tác giả Thế Lữ, Tố Hữu, Tản Đà mong các bạn, ac giúp đỡ e vs ạ

Mn giúp em với ạ.......... Ex 2. Combine these two sentences, using the cues given in brackets : 1. She said nothing. She didn’t want to wake the baby up. (so as not to) => ……………………………………………………………………………………… 2. I’ll write to Mai. I want to invite her over on my birthday party. (so as to) => ……………………………………………………………………………………… 3. I’m learning English. I want to read books in English. (in order to) => ……………………………………………………………………………………… 4. Name does morning exercises regularly. He wants to keep fit. (so as to) => ……………………………………………………………………………………… 5. You should practice speaking English every day. You can improve it rapidly. ( in order to) => ……………………………………………………………………………………… 6. Mrs. Hoan gave up the job. She could have more time with her children. (so that) => ……………………………………………………………………………………… 7. You have to wear warm clothes. You won’t catch a cold. (so as not to) => ……………………………………………………………………………………… 8. He buried up to the station. He didn’t want to miss the train. (in order not to) => ……………………………………………………………………………………… 9. He locked the door. No one could disturb him. (so that) => ……………………………………………………………………………………… 10. Mr. Tan saves money. He can buy a new house. (so that) => ………………………………………………………………………………………

Giúp mình với nha :Viết bài văn làm rõ tư tưởng nhân nghĩa của nguyễn trãi qua đoạn 1 của bài bình ngô đại cáo

a) AgNO 3 + ............. --> Cu(NO 3 ) 2 + ............... b) ...... +...... -->BaCO 3 c) SiO 2 + CaO--> .................... d) SiO 2 + NaOH--> ...............+ ................ e) ..........+ Fe(OH) 2--> FeSO 4 + ........... g) .............+.............. -->CaCO 3 +H 2 O

I. Give the correct form of the word given to complete the sentences. 1. I always go to the pagoda and visit my ______during Tet holiday. (RELATION) 2. Tet is a special occasion for family_____. Every family member enjoys themselves together during that time. (GATHER) 3. We made a lot of Banh Chung and cleaned the house to _____ Tet. (CELEBRATION) 4.______, children will receive lucky money from adults during Tet holiday. (TRADITION) 5. During Tet, we go to the pagoda to pray for good health,____ and wealth. (HAPPY) 6. We shouldn’t eat a lot of sweets because we can have a _____ or astomach ache during Tet. (TOOTH) 7. It's so____ to have a spring vacation in Sa Pa. (FANTASY) 8. There are lots of interesting _when you visit Hoi An Ancient Town. (ACT) 9. They want their local environment to maintain _____without people's bad actions. (NATURE) 10. Tet is a busy time for house____. People usually clean the house and buy flowers, kumquat trees or red envelopes. (DECORATE) 11. My father will spend an amount of time____our walls before Tet. (REPAINT) 12. There are many wonderful streams and waterfalls in____areas. (MOUNTAIN) 13. When they went camping in the forest, they brought_____bags to avoid dangerous insects. (SLEEP) 14. I had a(n)______trip to Tra Co Beach last week. I sunbathed on the beach and swam in the sea all day. (FORGET) 15. Hue is one of the tourist______in Viet Nam. I'd like to visit the Perfume River and many ancient tombs there. (ATTRACT) 16. ____, you can find various plants and animals in Phu Quoc Island. (INTEREST) 17. You must be _________ when you cross the busy streets. (CARE) 18. This is the ______ pagoda in our country. (OLD). 19. Do you know what the ______ of the river ? . (DEEP) 20.This tree has a lot of green_______ (LEAF)

Hỗn hợp X gồm ( Fe Cu Al ) cho 0,5 mol X td hoàn toàn với dd HCl dư thu được 0,4 mol H2 . Biết 47,6 gam X td vừa đủ 29,12 lit Cl2 ở Đktc . Tính % Kl Fe trong X

Cho tam giác ABC có góc B bằng góc c hai tia phân giác của góc B phẩy C lần lượt cắt AC AB tại M và N Chứng minh BM = CN B Gọi O là giao điểm của BM và CN chứng minh om = C Kẻ AH vuông góc với AC tại H ik vuông góc với AB tại K chứng minh o h Ok Gọi I là trung điểm của BC Chứng minh a,o,e thẳng hàng

2 xe cùng khởi hành 1 lúc từ 2 địa điểm A và B cách nhau 180km và sau 2 giờ chúng gặp nhau Biết xe đi từ A có vẫn tốc lớn hơn xe đi từ B là 10 km/h Tính vẫn tốc mỗi xe