Bài 3: Cho tam giác nhọn ABC,kẻ đường cao AH.Từ H kẻ HE vuông góc với AB (E thuộc AB),kẻ HF vuông góc với AC (F thuộc AC). a)C/m AE.AB=AF.AC b)Cho AB=4cm;AC=3cm.Tính AE,BE

1.likes/ Mai/ Math/ but/ good at English/ is/ studying/ she. 2.the bed/ in front of/ there/ a bookcase/ is/ my bedroom/ in. 3.wears/ at/ Phong/ uniform/ school/ his. Sắp xếp câu theo đúng trình tự.

1) Fill in each gap with the missing question or sentence in order to finish the conversation between the reporter (R) and the village (V). - What do you think of them ? - Would you like them to come back ? - Did they give you anything ? - Well, they'll come back soon, I guess. Well, I have to go. Have a good day. - Do you still get wet after the repair. V : My house had a hole in the roof and we got wet when it rained. R : (1)____________________________________________________ V : Well, it's good now. We don't get wet any more. R : (2)____________________________________________________ V : Yes. They gave US a big carton of 30 packets of instant noodles, 10 kilograms of rice, and some canned fish. R : (3)________________________________________________ V : They were very kind and nice. I love them. R : (4)__________________________________________________ V : Do you know when they come back ? R : (5)_____________________________________________________ V : Sure. Thank you veru much. Goodbye. R : Goodbye 2) Choose the correct answer A, B, C or D to fill each blank in the following passage. Each year volunteers rom England work abroad : teachers, nurses, engineers, and people with specialskills. they do not go for money. Volunteers from Voluntary Sercice Overseas ( VSO ) receive the (1)______ pay as a local colleague. VSO first (2)________in 1958 when 14 young school leavers went away for a year. Onlythree years late three were 176 volunteers in 25 different countries, andten years later there were 15,000 volunteers. at first, almost everyone (3)________young, and without very muchexperience. But in the late 1960s, VSO reduved the number of young people, and more and more older, experienced people with different skills went abroad. Now more than 20,000 people from England have worked abroad as volunteers, some areyoung, (4________are old. Abroad they live simply with the local people, and they return (5)___________England with great understanding of other people in other parts of the world. 1) A. like B. same C. similar D. average 2) A. was starting B. has started C. started D. starts 3) A. was B. is C. were D.are 4) A. other B. another C. the other D. others 5) A. in B. to C. at D. for

Hòa tan hết 2,7g nhôm (Al) vào dung dịch HCl.Tính thể tích khí thoát ra ở (đktc)?

___ at Steve and Janet's house until March.

một đội công nhân có 8 người làm trong 6 ngày dc 360m đường.hỏi 12 người đắp xong 1080m đường trong bn ngày

Giúp mk bài này nha nhanh tay sẽ có thưởng

phương trình sin X+2/cos X=m vô nghiệm khi?

1.một đội công nhân có 38 người nhận sửa một đoạn đường dài 1330m trong 5 ngày.hỏi muốn sửa đoạn đường dài 1470m trong 2 ngày cần bn công nhân 2.để chuêỷ chở 39kg hàng hoá trên quãng đường 74km phải chi hết 120 000đ.hỏi phải chi hết bn tiền để chở 26kg trên quãng đường dài 185km

Cần bao nhiêu ml dung dịch H2SO4 2M để phản ứng vữa đủ với 100 ml dung dịch NaOH 1M