Thực hiện phép tính (sử dụng hằng dẳng thức nếu có) giúp mình vs ạ 1,(x+2y+3x)(x-2y+3x) 2,(x^2+3x+1)^2 +(3x+1)^2 3,(3x-xy^2)^2-(2+xy^2)^2 3,(x-y-6)(x-6+y) 4,(x-3)^3+(2-x)^3 5,9x^2-(3x-4x)^2 6,(a^2+2a+3)(a^2+2a-3) 7,(3y+4)(9y^2-12y+16)

Trình bày những thuận lợi và khó khăn của nước ta về thành phần dân tộc?

Đặt 2 câu vs các từ sau đây: -Rushing -whistle -hurry -engine -tickets -pulling -trams -platform

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: " ? L K U G G K UH O H YU TY FD S R A C Z Q G X B H ! $ ^1 9 5 3 0

Giúp mình bài này với mn đang cần gấp

Mọi người giúp em 20 câu này ạ chỉ là điền từ vào chỗ trống thôi á

So sánh quốc gia cổ đại phương Đông với quốc gia cổ đại Hy Lạp và rô-ma về: địa điểm, điều kiện tự nhiên, kinh tế chính,thời gian ra đời,cơ cấu xã hội,hình thức nhà nước

help me , giúp với trc 2h mik phải nộp

1. Volunteers can do general __________ such as clean-up projects or home repair. A. things B. labour C. jobs D. activities 2. They have decided to ___________ the neighbourhood because it is full of rubbish. A. clean up B. wash up C. throw away D. litter 3. We came to the remote village and __________ meals for homeless children. A. cook B. offered C. do D. made 4. Have you ever __________ to Sapa? A. seen B. been C. visited D. gone 5. You can help young children by __________ them to do homework before or after school. A. teaching B. doing C. helping D. offering 6. I ______ blood twice, and ____ presents to sick children in the hospital recently. A. donate – give C. have donated – have given B. donated – gave D. have donated – gave 7. To help people in remote areas, we can __________ transportation, such as giving rides to the elderly A. give B. bring C. provide D. donate 8. Our school has a programme to ____ children from poor families in HCM city. A. tutor B. offer C. ask D. volunteer 9. Community service is the work we do for the _____________of the community. A. benefits B. forces C. problems D. events 10. Nowadays people ____ hours sitting in front of computers. A. spend B. last C. set D. Take 11. Be a Buddy has ___________education for street children. A. given B. spent C. provided D. helped 12. Last summer vacation, I took part in ‘the green summer campaign’ which offered a lot of ___________ work to help the community. A. volunteer B. help C. encourage D. tutor 13. A simple action of picking up a piece of garbage also ___________ your community, which helps the streets cleaner and nicer. A. provides B. encourages C. benefits C. gives 14. People in the _______________ are suffering a lot from lacking food, fresh water and home because of the continual heavy rain. A. flood B. drought C. mountain D. valley 15. A lot of people in the world ___________ to help people in the earthquake in Haiti. A. are afraid B. are useful C. volunteer D. encourage III. Complete the sentences with the present simple or present continuous form. 1. He (come) from Da Nang. 2. Do you study English? No, I (do not) 3. I (do) my homework after school. 4. Mr Mike (teach) physics. 5. Phong often (play) football at the weekend. 6. We (visit) our grandparents now. 7. They (not go) to work on Saturdays and Sundays. 8. Mr. Ninh (not work) in the office tomorrow. 9. Mary (have) short hair. 10. She (walk) to school with her friends every day.