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!

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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.