tính giá trị của biểu thức (2,8 + 1,6)*0,5 :2

ĐÂY LÀ TRẮC NGHIỆM CHỈ CẦN KHOANH ĐÁP ÁN THUI câu 1: PUHH có thể xảy ra sự oxi hóa là A) 4NH3 + 5O2--->4NO+6H2O B) Na2O+H2O---> 2NaOH C) CaCO3------> CaO+CO2 D) Na2SO4+BaCl2---->BaSO4+2NaCl Câu 2 Nhóm công thức nào sau đây biểu dienx toàn oxit: A) CuO;CaCO3;SO3 B) N2O5;Al2O3;SiO2 C) FeO;KCl;P2O5 D) CO2;H2SO4;MgO CÂU 3: phản ứng nào là phản ứng hóa hợp? A) CuO+H2---->Cu+H2O B) CO2+Ca(OH)2---->CaCO3+H2O C) 2KMnO4----> K2MnO4+MnO2+O2 D) CaO+H2O---->Ca(OH)2 mong mn giúp đỡ

hãy giới thiệu về 1 nghề tương lai em định lựa chọn trong tương lai

a] Thế nào là rút gọn câu ? Mục đích của việc rút gọi câu là gì ? Cần lưu ý gì khi sử dụng việc rút gọn câu? b] Hãy viết 1 đoạn văn { KHOẢNG 7--10 CÂU} có dùng câu rút gọn ? chỉ rõ thành phần đc rút gọn đó. ai trả lời đc mink vote cho 5 sao nhé ai nhanh tay thì sẽ đc câu trả lời hay nhất nhé. mink cảm ơn .

Viết đoạn văn giải thích câu tục ngữ "Tốt gỗ hơn tốt nước sơn"

Giúp mình nhé ! ĐỀ 4 I, Choose the best answer to complete the following sentences: (2.5) 1. I put my hat on _________ protect my face from the sunlight. a.for ​​b.in order ​​c.in order to​​d. not to 2.Don’t give the victim any food or drink if he or she gets________. ​a. fainting ​​b.shock ​c.burn​​​d.cold 3.The boy _______ next to Hoa is a new comer. ​a.sits ​​​b. to sit ​​c. sitting​d. sit 4. We ________ in Le Nin park when it rained. ​a.walked​b.were walking​c.have walked​​d. are walking 5.Would you mind if I________ on the television? ​a.will turn​​b.was turning​​c.turned​d. turn 6. Color television __________ by John Logie Baird in 1928. ​a. invented ​b. was invented​c. has invented​​d. is invented 7. The bike__________ in Japan is USD100. ​a.making​​b. made ​c.to make​​d. make 8. We have learned English__________ 2000. ​a.since​​b.for ​​​c.in​​d. from 9.Their parents are happy _________ good news from their teacher. ​a.hear​​​b. to hear​​c.hearing​d. heard 10.She is looking forward to________ a good job ​a.get ​​​b.getting​​c.gets​​d. to get II,Rewrite the following sentences: (2.5) 1.My father bought me some colored pencils. Some____________________________________________________. 2.’’Do you read this information, Lan ?’’. Ba asked Ba asked _________________________________________________. 1. The students learn how to recycle waste paper. They are very excited. The students are ____________________________________________. 2. she (practice) her piano lesson at 7 o’clock last night. _________________________________________________________. 5.This dress was made by a famous tailor. A famous tailor___________________________________________.

...............on the wrong side of the road? A.have you ever driven B.has you ever driven C.have ever you drove D.have you ever drove

Another positive aspect of tourism is that it helps ________international understanding and cooperation. A. promotes B. promoting C. to promote D. promote

Choose the words whose underlined part is pronounced differently from that of the others in each group 1. A. put B. adult C. junk D. sun 2. A. itchy B. riding C. sick D. swimming 3. A. chemical B. children C. headache D. architect 4. A. regularly B. identify C. really D. healthy 5. A. cycling B. doctor C. aerobics D. calories 6. A. coordinate B. triathlon C. allergy D. calorie 7. A. leaf B. life C. knife D. of 8. A. monopoly B. melody C. compound D. concentrate 9. A. paragraph B. cough C. although D. enough 10. A. vegetarian B. depression C. essential D. attention 11. A. myth B. cycling C. itchy D. allergy 12. A. headache B. spread C. health D. weak 13. A. fat B. leaf C. of D. safe 14. A. flu B. sunburn C. junk D. much 15. A. wash B. wear C. wake D. wrap 16. A. sick B. swimming C. itchy D. riding 17. A. really B. healthy C. regularly D. identify 18. A. bad B. tall C. dad D. sad 19. A. although B. enough C. paragraph D. cough 20. A. traditional B. essential C. audition D. picture

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