cho tam giác ABC có góc A=120 độ,BC=a,AB=c,AC=b.Chứng minh $a^{2}$ =$b^{2}$+ $c^{2}$ +bc

tính tổng các số nguyên x biết : a/ -5 ≤ x + 7 ≤ 5 b/ 1< |x-2|< 5

Giải hệ pt sau: (Căn 5+2)x+y=3-căn5 -x+2y=6-2căn5

Cho a,b,c,d,m,n là các số nguyên dương thỏa mãn a/b<m/n<c/d và bc-ad=1 . CMR giá trị nhỏ nhất có thể của m là a+c và giá tị nhỏ nhất có thể của n là b+d

nêu những thuận lợi và khó khăn của hình dạng lãnh thổ VN

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Vẽ chibi hoặc đậu mầm :Đ

II. Give the correct form of the words in capital letters. Write your answers in the blanks. There is an example at the beginning (0). 0.If you get a burn, cool it ___immediately__. (IMMEDIATE) 1.Many species are now _____________________ and something should be done to protect them. (DANGER) 2.He is one of the most famous _____________________ in Vietnam. (HISTORY) 3.It is ____________________ of you to make fun of the disabled. (SENSE) 4.Deforestation and excessive farming have ____________________ the soil. (POOR) 5.Mr. Jones is at risk of having a heart attack and must reduce his ________________ of fatty foods. (CONSUME) III. Finish the second sentence so that it has a similar meaning to the first sentence, using the clues at the beginning of each sentence. 1. Just after their arrival, they heard that terrible news. Hardly __________________________________________________________________________________ 2. I would prefer you to pay in cash. I’d rather ________________________________________________________________________________ 3. It wasn’t necessary for you to bring warm clothes as it wasn’t cold. You needn’t _____________________________________________________________________________ 4. He is trying to give up smoking. He is making____________________________________________________________________________ 5. Although he was exhausted, he managed to get to the destination. Exhausted______________________________________________________________________________ IV. Complete the second sentence so that it has a similar meaning to the first sentence, using the word given in brackets. Do not change the word given. There is an example at the beginning (0). 0. They sent him to prison for three years. (SENTENCED) He was sentenced to three years in prison. 1. As far as I know, he is still working in New York. (KNOWLEDGE) To ________________________________________________________________ 2. She is proud of being able to communicate in English effectively. (PRIDES) She ______________________________________________________________ __________________ 3. I don’t care whether you go or not. (DIFFERENCE) It _____________________________________________________________________________________ 4. The film wasn’t as good as we expected. (COME) The film _______________________________________________________________________________ 5. Winning the first prize meant we could buy a new car. (ENABLED) Winning the first prize ___________________________________________________________________ V. Use suggestions to make complete sentences. Make any changes if necessary. You can add more words but cannot omit the given words. 1.I/ going/ get/ my house/ decorate/ next week. ______________________________________________________________________________________ 2. It/ our suggestion/ that/ each member/ prepare/ part/ assignment. ______________________________________________________________________________________ 3. Dr. Fleming/ who/ discover/ penicillin/ award/ Nobel Prize/ Medicine/ 1945. ______________________________________________________________________________________ 4. Tropical forests/ completely destroyed/ future/ unless/ we/ can/ stop/ cut down/ trees. ______________________________________________________________________________________ 5. In recent years/ there/ be/ growing/ interest/ fitness/ among/ young adults. ______________________________________________________________________________________ ______________________________________________________________________________________

Dẫn khí flo vài dung dịch kcl. Thì flo tác dụng với nước trước hay với kcl trước biết độ âm điện của oxi lớn hơn clo

Mấy b giúp mik giải với Chi tiết luôn nha😍😍