(完整版)八年级数学上学期易错计算题专练(精心整理)含答案,推荐文档

1、一计算八年级数学易错计算题专练1、 -66 (-6)62、(- p2 )33、(4 104 ) (3102 )4 、 a5 a2 (-a2 )5、(- 1 x2 y3 ) (- 1 x2 y)326、(6x - 4)(3x + 2)7、(4x3 y + 6x2 y2 - xy3 ) 2xy (-7xy2 )2 ( 1 x2 y - y2 )78、 4021 39（简便计算）9、3310、 (m - n)(m + n)11、 (2m - 3n)212、(-a - b)(-a + b)13、 (a + b - c)(a - b + c)14、(a - b - c)215、 (x - 2)(x +

2、2)(x2 + 4)17、 (3a - 4b + 2c)216、(-x + 2 y)218、已知 a + 1 = 5 ,求 a4 + 1 的值aa419、已知 a + b = 4 , a2 + b2 = 11 ,求(a - b)220、已知 xa = 3, xb = 2 ,求 x2a+b二、分解因式：（1） a 2 (x - 1) + b 2 (1- x)（2） (m2 + n 2 )2 - 4m2n 2（3） x 4 - 16（4） 6xy - x 2 - 9 y 2（5） (x + y)2 - 10(x + y)+ 25（6） - 16 + 9x 2（7） (m + n)2 - 4n 2（

3、8）a2 - b2 + 4b - 4（9）.x 2 - 4xy - 1 + 4 y 210.下列各式从左到右的变形是因式分解的是（）.a. x 2 + 2x + 3 = (x + 1)2 + 2b. (x + y)(x - y) = x 2 - y 2c. x2xyy2(xy)2d. 2x - 2 y = 2(x - y)三、计算解方程(一定要检验）（1） 1-2=12(2)1+ x -1 =-3x + 33 - xx2 - 9x - 22 - x（3）计算a2 a - 1- a - 1答案“”“”at the end, xiao bian gives you a passage. minan

4、d once said, people who learn to learn are very happy people. in every wonderful life, learning is an eternal theme. as a professional clerical and teaching position, i understand the importance of continuous learning, life is diligent, nothing can be gained, only continuous learning can achieve better self. only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet the needs of the market. this document is also edited by my studio professionals, there m