Một con gà nặng 3700g,một túi rau nặng 700g. , một túi thịt nặng 350 g . Hỏi gà thịt và rau nặng bao nhiêu g

Cho tam giác ABC vuông tại A.BD là trung tuyến. Kẻ DE vuông góc DC tại E.chứng minh a)BE²-CE²=BD²-CD² b)AB²=BE²-CE²

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vẽ vịt đập hoặc đánh , ăn con vịt vẽ bằng app

the letter A, B,C or D on your answer sheet to indicate the option that best complete each of the following exchanges. Question 23: John:“My first English test was not as good as I expected.” Jack: “-___________.” A. Good heaven! B. Very well, thanks. C. Never mind, better job next time D. How do you do? Question 24: Peter:“ Why don’t we wash our hands regularly to avoid coronaviruss?” David: “___________.” A. Thank you! B. Yes, let’s do that C. Not at all D. You’re wecome. Reading the following passage and mark the letter A,B,C or D on your answer sheet to indicate the correct answer to each of the questions from 25 to 29. Tigers are one of the most powerful and graceful animals in the world. The different species that still exist today, namely the Bengal, Indochina, Siberian, South China and Sumatra tigers are in danger of becoming extinct. Due to irresponsible hunting, the Bali, Caspian and Java tigers have already become extinct. This could soon happen to the other species too. In the past, tigers were considered as pets. With a smaller area to hunt, as man had taken up more of the land to build upon, the tigers found less area for themselves to hunt. They thus turned to farms to get their food. Farmers‘ livestock were attacked by these tigers. People were then encouraged to hunt and kill these animals with the promise of rewards. Even after the threat of tigers on livestock was over, man continued to hunt tigers, this time for recreation. Poachers hunt tigers for their body parts knowing that the skin of tigers is much bought after. Bones and other organs are also used as ingredients in traditional Chinese medicine. Although killing is illegal, it is still being carried out unless it is stopped, the remaining species of tigers will soon become extinct too. Question 25: How many species of tigers were there originally? A. three B. four C. five D. eight Question 26: There were fewer hunting grounds for the tigers because __________ A.man had occupied the land B. the farmers put their livestock there C. the tiger population was becoming bigger D. they liked hunting livestock Question 27: Man continues hunting tigers even they are no longer pets because A.he treats it as a form of recreation B. he loves tigers very much C. he still thinks tigers are pets D. he wants to make the tigers extinct Question 28: Poachers are people who _________ A.look after tigers B. make Chinese medicine C. hunt tigers illegally D. hunt tigers‘body parts Question 29: Illegal poaching will ________ A.cause the extinction of tigers B.increase the amount of Chinese medicine C.increase the amount of Chinese medicine D. increase the price of body parts

Ở Bò tính trạng có sừng và không sừng đều nằm trên NST thường. Một bò cái không sừng (1) giao phối với Bò đực có sừng (2), năm đầu tiên đẻ được 1 con bê có sừng (3) và năm sau đẻ được 1 con bê không sừng (4). Con bê không sừng này lớn lên cho giao phối với bò đực không sừng (5) đẻ được con bê có sừng (6). a) Xác định tính trạng trội lặn. b) Xác định KG của mỗi cá thể nói trên. c) Lập sơ đồ lai minh hoạ.

Vẽ avt vịt NL: Yew tất cả các bạn vịt <3

Ai giúp mình với 1 tuần nữa nộp rồi

Cho a+b=3 , a ≤1 . cmr : C=b ³ -a ³ -6b ² -a ² +9b ≥ 0

giải giúp mình với, mình hết điểm rồi huhu