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Cho đa thức N=ax ²y-2xy ²+3xy-2x ³y-7x+1.. Biết rằng đa thức này có bậc 4 và a là một số nguyên tố nhỏ hơn 5. Hãy tìm a.
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*Choose the correct words (from A, B, C, or D) below to complete the passage: The carnival in Rio de Janeiro, Brazil is the biggest carnival in the world which (11) _________ for five days. Every year in the month of February the festivities start. Hundreds of people are (12) ________on the streets enjoying the street bands, singers and orchestras. The main (13) ______ of the carnival is the Samba Parade in which 200 schools participate. The schools have elaborate costumes, floats and dancing styles. It is an (14) _______ experience! Come August and it’s (15) ___________ to have fun in Bunõl, Spain. La Tomatinaa fun filled battle – begins on the last Wednesday of August. Thousands of people come from all over the world to participate in a grand tomato fight. 11. A.gets B. lasts C. makes D. longs 12. A. down B. along C. into D. out 13. A. theme B. notice C. highlight D. guide 14. A. amazing B. unpleasant C. obvious D. actual 15. A. view B. means C. time D. celebration

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