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2 năm trước
Làm giúp mình đi chỉ có một câu giải còn lại là trắc nghiệm à Câu 1: Rút gọn: ( 2 x – 5 ) . ( 2x + 5 ) + ( 2 x + 1 )2 - ( x - 5 )2 Câu 2 : Giá trị của biểu thức (x – 2)(x2 + 2x + 4) tại x = - 2 là: A) - 16 B) 0 C) - 14 D) 2 Câu 3: (27x3 + 8) : (3x + 2) bằng: A) 9x2 – 6x + 4 B) 3x2 – 6x + 2 C) 9x2 + 6x + 4 D) (3x + 2)2 Câu 4: Kết quả phép nhân (2x2 – 3x + 1)(x -1) là: a) 2x3 – 2x2 +4x – 1 b) 2x3 – 5x2 + 4x – 1 c) 2x3 - 3x2 +x – 1 d) Kết quả khác Câu 5: (x – 2)2 + x – 2 = a ) ( x – 2) ( x – 1) b ) ( x – 2) ( x + 1) c ) ( x + 2) ( x – 1) d) ( x – 2) x Câu 6: Đa thức (2x2 + 3x3 ) chia hết cho đơn thước a ) 5x2 b) 2 x3 c) 3x3 d ) 5x5
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