Câu 1, Cho đa thức A(x)=3x^3+2x^2-x+-3x và B(x)= 2x-3x^3+3x^2-5x-1 a) Thu gọn đa thức A(x),B(x) rồi sắp xếp A(x),B(x) theo lũy thừa giảm dần của biến x . Tìm bậc của A(x),B(x) b) tính A(x)+B(x) c) tính A(x)-B(x) Câu 2 Cho đa thức A = x^2-xy+y^2 . Tính giá trị của đa thức A tại x = 1 , y = -2

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