cmr: (3^2012)-9 chia hết cho 13

Phân tích đa thức thành nhân tử a) $a^{6}$ + $a^{4}$ + $a^{2}$ $b^{2}$ + $b^{4}$ - $b^{6}$ b) $x^{3}$ + 3xy + $y^{3}$ - 1

11. There is a special_______for Japanese girls on March 3rd every year. A. celebrate B. celebration C. celebratory D. celebrating 12. _________do people celebrate the festival? - They celebrate it in a special way. A. How often B. What C. Why D. How 13. Non-renewable energy sources like coal, natural gas and_________produce a lot of carbon dioxide. A. wind B. hydro C. oil D. solar

Giúp mik `3` ý này Cảm ơn nhiều ạ!

8. People often laugh a lot when they see __________film. A. comedy B. science fiction C. horror D. documentary 9. The film didn't receive good reviews from critics._________, many people went to see it. A. However B. Nevertheless C. Although D. A&B are correct 10. Rock in Rio and the Cannes film Festival are__________festivals. A. religious B. seasonal C. music and art D. superstitious

5. You should look right and left when you go__________the road. A. along B. up C. down D. across 6. Public_________in this city is quite good, and it's not expensive. A. journey B. transport C. vehicles D. travel 7. __________should walk across the street at the zebra crossing. A. Drivers B. Pedestrians C. Cyclists D. Motorists

Bài 1 cho a-b+c=0 đặt A= 4bc+a^2/2a^2-bc ;B=4ca-b^2/ca+2b^2 ;C= 4ab+c^2/2c^2-ab CMR A.B.C=1 Moi nguoi giup minh voi a

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