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nhan2452005
2 năm trước
Câu 1: Trong các biểu thức sau , biểu thức nào là đa thức ? 22 A.2x. B.3xyz. C.7x –2x. D.xy . Câu 2 : Trong các biểu thức sau, biểu thức nào không phải là đa thức ? 2322 A.2x+yz. B.5yz. Câu3:Giátrịcủađathức A=x –y tại x=2,y=–2là?. A . 16 B . 8 C . 5 D . 0 . Câu4:ThugọnđathứcP=3x2y–2xy2 +6x2y –4x2y nhậnđượckếtqủalà? A . P = x2y B . P = x2y +2xy2 C . P = 5x2y – 2xy2 D . P = 5x2y + 2xy2 Câu5:Bậccủađathức C=5xy2 +2xz3 làbaonhiêu? A.3 B.4 C.5 D.6. 232 Câu6:Giátrịcủađathức B=5x y – xy tại x=2,y=1là?. A . 13 B . 14 C . 15 D . 18 .
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