Giải giúp mình với mn giải ra bài tập

Chứng minh (c+a)/√ (c^2+a^2) >= (c+b)/√ (c^2+b^2) với a>b>0, c>√ab

Cho tam giác ABC và đường thẳng d đi qua A song song với BC . Từ D thuộc cạnh AB kẻ DE // BC ( E thuộc AC ) . BE , CD cắt d lần lượt tại I , K a, Cm AI/BC = IA/CE và AK/BC = KA/CD b, Cm IA = AK c, Gọi M là trung điểm BC , BE cắt CD tại O . Cm A, O ,M thẳng hàng.

Lập bảng thống kê các cuộc đtranh tiêu biệu thới kì Bắc thuộc của nước ta theo nd sau:tên cuộc khởi nghiã ,tgian,người lãnh đạo kẻ thù ,kết quả,ý nghĩa

Giúp em bài này với ạ! Cần gấp Cảm ơn nhiều ạ! Bài 1: Fill in the blank with the correct form of the given word. 1.​Many people don’t know about the ………………. of soil pollution.​ 2.​The river is seriously ……………….by the factory’s waste.​ 3.High blood ……………….can be brought about by noise pollution. 4.​The water color can show us how​……………….the river is.​ 5.​A lot of ……………….fish are floating on the surface of the lake.​ dangerous contaminate press pollute die VIII Find one mistake in each sentence and correct it. ​1.​Constant exposure to noise pollution will lead in the loss of hearing​​ ​ A​ B​ C​ D ​2.​Because of we turned on a lot of bulbs, our eyes got strained.​​​ ​​ A​ B​ C​ D ​3.​If he reads this article, I guess that he would never do any​​ ​​ A​ B​ C ​​harms to environment any more. D​​ ​4.​The local citizens would be very happy if they were supplied with a ​​ ​​ A ​ B​ C​ D ​​clean water. ​5.​If the environment were not polluted, birds wouldn’t leave​​ ​​ A​ B ​​their habitats and plants would die. ​​ C​ D​​

Làm bài thơ tả cảnh mùa thu(ko chép mạng)

Giúp em bài này với ạ! Em cảm ơn nhiều! Cần gấp ạ! Read the passage. ​There are three main (1) ……………… of pollution: air pollution, water pollution and noise pollution. Air, which is the most important element of our environment for our (2) ……………………, can be polluted in many ways. Smoke in the air from mills, factories and industry (3) …………………… carbon, monoxide, carbon dioxide, and methane, which are all poisonous gases. This leads (4) …………………… health problems like asthma and lung diseases, and the thinning of the ozone layer, which (5) …………………… us from harmful UV ray. China, the USA, Russia, India, Mexico and Japan are the world leaders in air pollution (6) …………………… Water is also polluted by the discharge of commercial and industrial waste. Sewage in drinking water is another (7) …………………… of water pollution as it contains germs and viruses. The noise of vehicles, mills, and factories can be really unbearable. This kind of constant sound also (8) ……………… headaches, tension, (9) ……..………… stress and migraines. People living next to a building site where there is too much noise can become sick, as they can not sleep or relax. This is (10) …………………… noise pollution.

Tính chu vi hình tròn có A)bán kính r=9m. B)đường kính d=0,75cm C)bán kính r=2 1phần2 cm

Giải giúp mình câu h, m, p, n, q với ạ Đề là giải các bất phương trình

Giúp em bài này với ạ! Cẩm gấp Cảm ơn nhiều! V Choose the best answer (A, B, C or D). ​1.​………….. loss can be caused by noise pollution. ​A. sound​B. hearing​C. listening​D. audio ​2.​Ships spill oil in oceans and rivers. This leads ………….. the death of many aquatic animals and plants. ​A. to​B. in​C. from​D. at ​3.​Households pollute water sources by ………….. waste into ponds, lakes, and rivers. ​A. damaging​B. dumping​C. losing​D. leading ​4.​This month’s electricity bill is too high ………….. the air conditioner is turned on all the time. ​A. since​B. due to​C. although​D. because of ​5.​The government has come ………….. a solution to the water problems of the city. ​A. up to​B. up with​C. to with​D. on to ​6.​All the aquatic plants and animals will die if the factory ………….. dumping poison into the lake. ​A. will keep​B. to keep​C. kept​D. keeps ​7.​A lot of fish has died recently because of the ………….. water in this lake. ​A. contaminating​B. contaminated​C. contaminate​D. contaminant ​8.​If the air was clean, we ………….. have to wear masks when going out. ​A. wouldn’​B. won’t​C. would​D. will ​9.​If I ………….. you, I ………….. water from that dirty tap. ​A. am - will drink​B. am - won’t drink ​C. were - would drink​D. were - wouldn’t drink ​10.​If he ………….. trash around his garden, the garden would look very nice now. ​A. will throw​B. would throw​C. didn’t throw​D. doesn’t throw VI Put the verbs into the correct forms. ​1.​If people (be) ………………. fully aware of the dangers of air pollution, they (damage) ………………. the atmosphere this way. ​2.​If I (be) ………………. you, I (turn) ………………. the volume down for him to sleep. ​3.​We (not be) ………………. able to drink that water if it is not refined. ​4.​If you (reduce) ………………. the number of bulbs in your house, you (pay) ………………. less money for the electricity bill next month. ​5.​If many animals and plants die, it (unbalance) ………………. our ecosystem.