解答下列各题(1)计算:-22+(-12)-1-(3-1)0+3-8;(2)化简:(x-3)(x+3)-(x-3)2.-数学

题目简介

解答下列各题(1)计算:-22+(-12)-1-(3-1)0+3-8;(2)化简:(x-3)(x+3)-(x-3)2.-数学

题目详情

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
题型:解答题难度:中档来源:不详

答案

(1)-22+(-class="stub"1
2
)-1-(
3
-1)0+
3-8

=-class="stub"1
4
-2-1-2
=-5class="stub"1
4

(2)(x-3)(x+3)-(x-3)2
=x2-9-x2+6x-9
=6x-18.

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