Chứng minh biểu thức D=1-x+x^2 luôn dương

Tính Nhanh: C ≈ 111 111 + 222 222 + 333 333 + 444 444

Giups mình với ạ huhuhuhuhuhuhu

Cho tam giác ABC có AB=6cm, AC=4,5cm, BC=7,5 cm a. C/m tam giác ABC vuông tại A. Tính các góc B,C và đường cao AH của tam giác. b. Tìm tập hợp các điểm M sao cho diện tích ABC= diện tích BMC. Vẽ hình và làm bài đầy đủ, chi tiết, mình cảm ơn!

C1 . Nội dung đoạn trên C2 . Xác định biện pháp tu từ. Tác dụng C3 . Nêu 1 vài suy nghĩ, tc của em đc gợi ra từ đoạn văn trên

Mn ơi cho em hỏi là: x×2x3= bao nhiêu ạ

Exercise 2: Put the verb in the past simple tense: They (begin) __________ to study at this school 7 years ago. She (lose) __________ her handbag on the train yesterday morning. We (visit) ___________ that city last year. Peter and Daisy (be) __________ born in 1978. __________you (spend) _________ your holiday in Dalat last summer? She (clean) _______________the bicycle yesterday. They (start) __________school in 1998. My friend and I (go) __________________ to the seaside last week. We (spend) ___________________________ hours on the beach last Sunday. He (be) ______________________________ in Ha Noi last year. His father (die) _____________________ in 1930. Lincoln (work) __________________in this factory three years ago. I (do) _____________________my homework last night. Miss White (write) ______________________to her father last Monday. My parents (buy) _________________________the car last year. Hoa (read) _____________________________the book yesterday. He (listen) _______________________________to the radio last night. We (watch) _____________ a good programme on TV last night. Mary (go) _______________shopping for me yesterday. I (be) _______________ in Ha Noi last month. My parents (go) _______________to HCM city last week. Yesterday we (have) _______________a meeting at our school. Mary (meet) _______________her parents two week ago. She (be) _______________born in 1992. What you (do) _______________last night. Last summer I (study) _______________English in Can Tho City. She (not visit) _______________her son last week. In 1997 there (be) _______________a terrible storm. They (build) _______________the house twenty years ago. John (do not) _______________come to my birthday party last Sunday.

Giups mình với moi người ơiiiiiiii

II. Rewrite the following sentences using the equivalent structures. 1. He used to go to the zoo =>……………………………………………… =>……………………………………………… =>……………………………………………… =>……………………………………………… =>……………………………………………… 2. They used to play soccer when they were young =>……………………………………………… =>……………………………………………… =>……………………………………………… =>……………………………………………… =>………………………………………………

2. Compound adjectives exercises. Fill in the gaps with the compound adjectives in English to complete the sentences below. The adjectives should correspond to the first sentence and denote the meaning expressed in it. 1. The child behaves well. He is a ______________ child. 2. That man dresses in a scruffy manner. He is a __________________ man. 3. This film star is very conscious of her image. This film star is very ______________. 4. It takes ten minutes to drive from my house to work. It is a _____________ drive from my house to work. 5. They planned the attack in a very clever way. It was a very _____________attack. 6. My dog has got short legs. It is a _______________ dog. 7. That man always looks rather angry. He is a rather ___________ man. 8. His degree course took five years to complete. It was a ________________ degree course. 9. What’s the name of that perfume that smells horrible? What is the name of that _______________ perfume. 10. Only members who carry their cards are allowed inside. Only ___________ members are allowed inside.