Câu 1: Trong các biểu thức sau , biểu thức nào là đa thức ? A. 2x. B. 3x2 yz. C. 7x2 – 2x. D. xy . Câu 2 : Trong các biểu thức sau, biểu thức nào không phải là đa thức ? A. 2x + yz. B. 5y2 z. C. xy3 –7 . D. 4x2 + 3y2 z. Câu 3 : Giá trị của đa thức A = x 3 – y 3 tại x = 2 , y = –2 là?. A . 16 B . 8 C . 5 D . 0 . Câu 4 : Thu gọn đa thức P = 3x 2 y – 2xy2 + 6x 2 y – 4x 2 y nhận được kết qủa là? A . P = x2 y B . P = x2 y +2xy2 C . P = 5x2 y – 2xy2 D . P = 5x2 y + 2xy2 Câu 5 : Bậc của đa thức C = 5xy2 +2xz 3 là bao nhiêu ? A . 3 B . 4 C . 5 D . 6 . Câu 6 : Giá trị của đa thức B = 5x 2 y 3 – xy2 tại x = 2 , y = 1 là?. A . 13 B . 14 C . 15 D . 18

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