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20 12 Division of Algebraic Expression of Mathematics Set in National Senior High School Entrance Examination.
1、5

2 、( a+3)(a-3)

3、B

4、a？ b？

5、8 x^5

6、 1/4

7、6ab

8、2

9、a？

10 、( a+3)(a- 1)+a(a-2)

=a？ +2a-3+a？ -2a

=2a？ -3

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