题目内容
解答下列各题
(1)计算:-22+(-
)-1-(
-1)0+
;
(2)化简:(x-3)(x+3)-(x-3)2.
(1)计算:-22+(-
| 1 |
| 2 |
| 3 |
| 3 | -8 |
(2)化简:(x-3)(x+3)-(x-3)2.
(1)-22+(-
)-1-(
-1)0+
=-
-2-1-2
=-5
;
(2)(x-3)(x+3)-(x-3)2
=x2-9-x2+6x-9
=6x-18.
| 1 |
| 2 |
| 3 |
| 3 | -8 |
=-
| 1 |
| 4 |
=-5
| 1 |
| 4 |
(2)(x-3)(x+3)-(x-3)2
=x2-9-x2+6x-9
=6x-18.
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