tìm x thuộc Z biết: a)2x-1 chia hết Cho x+2 b)-3 ÷ (x-2) là số nguyên

Cho HPT : x+my= 11 5x-3y=m+1 Tính HPT khi m= 2 Tìm giá trị của m để HPT trên có nghiệm

Mọi người làm giúp mình câu 2c,2d,4,5 nhé. Xin cảm ơn.

cho 100ml dd NaOH 2M t/d vừa đủ vs 100ml dd H2SO4 a, tính nồng độ mol/l của dd H2SO4 phản ứng b, tính KL muối tạo thành

Các bạn giải đung mình vote 5* ok

Câu hỏi: 1. Em hãy kể ra các bước rửa tay đúng? 2. Hãy trình bày cách sử dụng khẩu trang đúng cách?

II.Put into the correct form of the following words. 1. Water puppetry is one kind of traditional……………….? (perform) 2. There were over fifty ………………. in the orchestra. (music) 3. We had a very ……………. party with so many delicious food and drink. (enjoy) 4. Life in Viet Nam is ………………. from life in America. (differ) 5. Enjoy this cake. It is really ………………. (taste) 6. You will never get ………………. because it is exciting. (boring) 7. The film was so ………………. because of its music and image. (thrill) 8. The food was so ………………. that I couldn’t eat any of it. (salt) 9. Staying at home is the most ……………… way of relaxation. (bore) 10. There were more than thirty ……………… in the class.(study) 11. It is ……………… to eat a lot of junk food.(health) 12. I love ……………… pottery because it makes me more creative. (make) 13. Water ……………… began in the 11th century.(puppet) 14. Our volunteer group always helps street ……………… when we have free time.(child) 15 .My uncle is a famous ……………… (art) 16. A thief stole all the ……………… in the museum. (paint) 17.Huong Pagoda is one of the ……………. places in Viet Nam. (culture) 18. Many students are……………. prepared for the final exam. (care) 19. Various employees have contributed to the ……………. of the company. (develop) 20. Kristen is one of the famous ……………. in America. (act) 21.All of the ……………. today are marvelous. (perform)

Fe2(SO4)3+NaOH--->Fe(OH)3+Na2SO4

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