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hoadungdcm598
2 năm trước
Bài 1: Thu gọn đa thức, tìm bậc, hệ số cao nhất. A=15.x^2.y^3+7.x^2-8.x^3.y^2-12.x^2+11.x^3.y^2-12.x^2.y^3 B=3x^5.y+1/3x.y^4+3/4x^2.y^3-1/2x^5.y+2x.y^4-x^2.y^3 Bài 2: Thu gọn đa thức sau: a) A = 5xy – y2 - 2 xy + 4 xy + 3x -2y; b) B =1/2a.b^2-7/8a.b^2+3/4a^2.b-1/3a.b^2 c) C = 2 -8b2+ 5a2b + 5c2 – 3b2 + 4c2. Bài 3: a)Tính tổng của các đa thức: A = x2y - xy2 + 3 x2 và B = x2y + xy2 - 2 x2 - 1. b)Tính giá trị biểu thức: A + B tại x =1; y= -1 Bài 4: Cho P = 2x2 – 3xy + 4y2 ; Q = 3x2 + 4 xy - y2 a)Tính: P – Q b)Tính giá trị P – Q tại x = -1; y=0
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