muốn thêm slide mới cần chọn lệnh nào

Dãy nào sau đây là của hợp chất axit: a. HCl, H2O, H2SO4, HNO3 b. H3PO4, HCl, HNO3, H2S c. H2O, HCl, H2SO4, HNO3 d. Mg(OH)2, HCl, H2SO4, NaOH

0,3x + 0,5y = 3 1,5x - 2y = 1,5

$\frac{1-x}{2x^{2}-4x}$-$\frac{1}{4x-4}$ = $\frac{x-1}{2x(x-2)}$ -$\frac{1}{2x}$

Lớp bì dưới da có chức năng: A. cảm giác, bài tiết, điều hòa thân nhiệt. B. tiếp nhận kích thích từ môi trường. C. bảo vệ cơ thể. D. bài tiết mồ hôi và điều hòa thân nhiệt.

tính 1/3+1/5-1/4= giải bài toán trên

IV. Choose the best answer A, B, Cor D for each sentence. 16. We ……………….from different kinds of pollution: water air, soil and noise. A.is suffering B.suffer C.are suffering D.had suffered 17.The babies when Alice came. A.has slept B.have slept C.is sleeping D.were sleeping 18.America…………….Thanksgiving Day on the fourth Thursday of November since 1864. A.celebrates B.has celebrated C.is celebrating D.celebrated 19.The fish died massively because the water is ………………... A.damaged B.hotter C.contaminated D.poison 20. A natural disaster can cause loss of life or damage. A.property B.house C.home D.money 21…………….. are severe winter storms characterized by heavy snow and strong winds. A.Droughts B.Blizzards C.Hailstorms D.Volcanic eruptions 22.The ……………..can be controlled by the stoppage of leakage from the radioactive materials including the nuclear reactors, industries and laboratories. A.light pollution B.visual pollution C.air pollution D.radioactive pollution 23. English is ………………….of Australia and Singapore. A.native language B.both A and C C.official language D.second language

Gọi tên đồng phân của ankin C8H14? Ankin C8H14 có bao nhiêu đồng phân?

làm sao ạ, ai chỉ em cách giải với ạ

Ex 1. Choose the most appropriate answer. 1. My teacher suggested I _____ harder to pass the exam.     A. studies B. study   C. studying 2. The professor suggested he _____ the research before March.     A. summit    B. summiting   C. summits 3. Her leader suggested _____ on time.     A. being     B. be     C. is 4. Linh suggests they _____ a meeting every week.     A. should have   B. have  C. Both A &B are correct 5. The coacher suggested that they _____ a Facebook group.     A. have    B. has  C. having 6. Her parents suggest she _____ married as soon as possible.     A. get  B. gets  C. got 7. We have suggested _____ to London for this winter vacation.     A. going    B. go     C. should go 8. My older brother suggests that I _____ tennis to have good health.     A. should play  B. playing  C. plays 9. We suggest _____ a postcard to our grandmother.     A. send    B. sending C. sent 10. It’s so cold outside. We suggest _____ the window.     A. should close B. close C. closing