专题训练( 四) 整式的加减运算计算：(1)a2b3a 2b；(2)2(a 1)(2a3) 3；(3)2(2a29b)3(5a2 4b)；(4)3(x3 2x2 1)(3 x34x2 2) ；(5)(7x25x3) (5x23x 2)；(6)3(x2 x2y 2x2y2)2(x2 2x2y3) ；(7)(2x2 3xy 1)(3x23xy x3) ；(8)a3b(a3b 2c)2(a3bc)；(9)(4 abb2)2(a22abb2)；(10)3(2x2 xy)4(x2xy 6)参考答案(1)原式4a. (2)原式 4. (3)原式11a26b. (4)原式2x21. (5)原式7x25x35x23x22x28x5. (6)原式3x23x2y6x2y22x 24x2y65x2 7x2y 6x2y26. (7)原式2x23xy13x2 3xyx3x26xyx2. (8)原式a3ba3b2c 2a3b2c0. (9)原式4abb22a24ab2b22a2 b2. (10)原式6x23xy4x24xy242x 27xy24.
