KT 15 phan da thuc

<span class='text_page_counter'>(1)</span>§Ò kiÓm tra §¹i sè 7 Thêi gian: 15 phót Bài 1: Khoanh tròn vào đáp án đúng: . 4 2 7 t zx.5tz 2 . z 7 2 lµ:. 1. Thu gọn đơn thức A. 10t4z3x B. -10t3z4x C. 10t3z4x D. -10t3z4x2 2. Có bao nhiêu nhóm các đơn thức đồng dạng trong các đơn thức sau: 2 xy 2 ; . 2 xy; 3 x 2 y;  x 2 y; . 1 xy; 4 xy 2 2. A. 1 B. 2 C. 3 D. 4 5 4 6 6 2 3 3. Cho ®a thøc M= x +x y – x + xy – xy – x . BËc cña ®a thøc M lµ: A. 3 B. 4 C. 5 D. 6 3 2 3 2 3 4. Thu gọn biểu thức: A = 5x y + 3x y – 4x y ta đợc kết quả là: A. x3y2 B. 5 x3y2 C. 4 x3y2 D. Mét kÕt qu¶ kh¸c Bµi 2: Cho hai ®a thøc: 1 A = 4x2y – 7xy2 – 5y3 + x3 – 6x2y + 4xy2 + 2. B = x2y + 2xy2 – x3 - 5y3 - 2 a. Thu gän ®a thøc A b. TÝnh A + B. c. TÝnh A – B.. Bµi lµm ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ............................................................................................................................................. ..............................................................................................................................................

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