nêu tính chất hóa học của phi kim,viết phương trình minh họa với phi kim lưu huỳnh

Cho tam giác ABC có AB=AC=5cm,BC=8cm.Kẻ AH vuông góc với BC ( H thuộc BC ). a)Chứng minh HB=HC và góc BAH=CAH b)Tính độ dài đoạn thẳng AH c)Kẻ HD vuông góc với AB ( D thuộc AB ) ,HE vuông góc với AC ( E thuộc AC ).Chứng minh tam giác HDE cân ( Vẽ hình giúp mình luôn ạ )

Làm giúp mình đi ạ mình cần gấp😭😭

Giúp mik câu 1 bỏ mấy câu ko cần làm nha

Giải hộ mình 3 bài tập này vs ạ Mình cần gấp ạ

61. People hold the festival to thank the Rice God for the crop. HELD ________________________________________________________________________ 62. Why are you going to Da Lat in December? FOR ________________________________________________________________________ 63. The film was boring, wasn’t it? INTERESTING The film___________________________________________________________it? 64. We often played these games when we were small. USED We________________________________________________________________ 65. What was the price of the first class ticket? PAY How_______________________________________________________________? 66. What is the distance from the village to the beach? IT How ________________________________________________________ to the beach? 67. The teacher was not satisfied with Tam’s essay. SATISFYING Tam’s essay__________________________________________________________ 68. They will install solar panels on the roof of our house next week. Solar panels_________________________________________________________________ 69. They will rebuild the power station at the beginning of next year. rebuilt The power station _________ at the beginning of next year. 70. Solar panels will be put in the back yard next Saturday. put They _________________ in the back yard next Saturday. 71. I will be with my brother in Son La hydro Power Plant at this time next week. staying At this time next week _______________ my brother in Son La Hydro Power Plant. 72. A test on sources of energy will be taken at 10 o’clock on Tuesday. taking We _________________ on sources of energy at 10 o’clock on Tuesday. 73. We shall be using wind power at this time next year. used Wind power _________________________ at this time next year. 74. These are ourpictures. These pictures…………………………………………………………….. 75. It is Julia’s thirteenth birthday next Friday. Julia……………………………………………………………………….. 76. Is your moyorbike black, Peter? Is the……………………………………………………………… 77.New York has more billionaires than Tokyo. FEWER ……………………………………………………………….. 78.A group of foreigners visited the slums last week, didn’t they? VISIT ………………………………………………………………….. 79.The countryside doesn’t suffer as much pollution as the city. LESS ……………………………………………………………………… 80.Does overpopulation cause a lot of social problems in this area? CAUSES ………………………………………………………………………. 81.Jakarta doesn’t have as many skyscrapers as Shanghai. MORE ………………………………………………………………………

Hai người thợ cùng làm một công việc . Nếu làm riêng rẽ , mỗi người nửa việc thì tổng số giờ làm việc là 12h 30ph . Nếu hai người cùng làm thì hai người chỉ làm việc đó trong 6 giờ. Như vậy , làm việc riêng rẽ cả công việc mỗi người mất bao nhiêu thời gian ?

tính diện tích hình thang có chiều cao bằng 4dm , đáy bé bằng 80% chiều cao và kém đáy lớn 1,2 dm ?

bài 5 nha anh truongtiennhat giup vs

(x-1)(x+3)-(x+2)(x-3) = 0 (x-2)(x-5)-(x+2)(x-3)=0 (3x-2)(4x+3)=2x(6x-1) 4x^2(2x+1)(2x-1)=0