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lelan7578
2 năm trước
Câu hỏi: Cho P(x)= 6x^4+ 7x^2 - x^3+2x-6 Q(x)= 7x^3+6x^4 - 7x^4 + 7x - 3 a. Sắp xếp P(x), Q(x) theo lũy thừa giảm dần của biến b. Tính P(x) + Q(x) ; P(x) - Q(x) GIÚP MÌNH VỚI CÁC BẠN
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