问题 解答题
解答下列各题
(1)计算:-22+(-
1
2
)-1-(
3
-1)0+
3-8

(2)化简:(x-3)(x+3)-(x-3)2
答案

(1)-22+(-

1
2
)-1-(
3
-1)0+
3-8

=-

1
4
-2-1-2

=-5

1
4

(2)(x-3)(x+3)-(x-3)2

=x2-9-x2+6x-9

=6x-18.

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