问题
解答题
解答下列各题 (1)计算:-22+(-
(2)化简:(x-3)(x+3)-(x-3)2. |
答案
(1)-22+(-
)-1-(1 2
-1)0+3 3 -8
=-
-2-1-21 4
=-5
;1 4
(2)(x-3)(x+3)-(x-3)2
=x2-9-x2+6x-9
=6x-18.
解答下列各题 (1)计算:-22+(-
(2)化简:(x-3)(x+3)-(x-3)2. |
(1)-22+(-
)-1-(1 2
-1)0+3 3 -8
=-
-2-1-21 4
=-5
;1 4
(2)(x-3)(x+3)-(x-3)2
=x2-9-x2+6x-9
=6x-18.