整式的乘除计算训练(1)
1. ?(a?b)?(2a?b) 2. (x+2)(y+3)-(x+1)(y-2)
3. (2x?y)(2x?y)?2y2 4.
5. 4????x2?y???????x2?y??? 6.
7. ?2a?1?2?2?2a?1`??3 8.
9. (x-3y)(x+3y)-(x-3y)2
x(x-2)-(x+5)(x-5) (3x?2y)(?2y?3x)(4y2?9x2)
?x?1?2??x?1??x?2? 10. 3(x?1)(x?1)?(2x?1)21
11. (3x?2y)2?(3x?2y)2 12. (x?y)2(x?y)2
13. 0.125100×8100
14. ?2?20?4??5?0?3?5??????4???(x??)?????1?2???(?2)
15. (?1)?2?(?1)2006?(2)11?(?312432)
16—19题用乘法公式计算
1
16.999×1001 17.992?1
18.982 19.20092?2008?2010
20.化简求值:(2a?1)2?(2a?1)(a?4),其中a??2。
21. 化简求值(x?2y)2?2(x?y)(x?y)?2y(x?3y),其中x??2,y?。
22. 5(x-1)(x+3)-2(x-5)(x-2) 23. (a-b)(a2+ab+b2)
12 1