题目内容
计算
(1)(-2)3+|1-
|-
+
(2)(3x-2)(2x+3)-(x-1)2.
(1)(-2)3+|1-
| 2 |
| 3 | 8 |
| 3 | 103 |
(2)(3x-2)(2x+3)-(x-1)2.
(1)(-2)3+|1-
|-
+
=-8+
-1-2+10
=
-1;
(2)(3x-2)(2x+3)-(x-1)2
=6x2+9x-4x-6-(x2-2x+1)
=6x2+5x-6-x2+2x-1
=5x2+7x-7.
| 2 |
| 3 | 8 |
| 3 | 103 |
=-8+
| 2 |
=
| 2 |
(2)(3x-2)(2x+3)-(x-1)2
=6x2+9x-4x-6-(x2-2x+1)
=6x2+5x-6-x2+2x-1
=5x2+7x-7.
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