题目内容
计算:
(1)-23+
×(2005+3)0-(-
)-2
(2)(a+b)(a-b)+(a+b)2-2(a-b)2.
(1)-23+
| 1 |
| 3 |
| 1 |
| 3 |
(2)(a+b)(a-b)+(a+b)2-2(a-b)2.
(1)-23+
×(2005+3)0-(-
)-2
=-8+
-9
=-17+
=-
;
(2)(a+b)(a-b)+(a+b)2-2(a-b)2
=a2-b2+a2+2ab+b2-2(a2-2ab+b2)
=a2-b2+a2+2ab+b2-2a2+4ab-2b2
=6ab-2b2.
| 1 |
| 3 |
| 1 |
| 3 |
=-8+
| 1 |
| 3 |
=-17+
| 1 |
| 3 |
=-
| 50 |
| 3 |
(2)(a+b)(a-b)+(a+b)2-2(a-b)2
=a2-b2+a2+2ab+b2-2(a2-2ab+b2)
=a2-b2+a2+2ab+b2-2a2+4ab-2b2
=6ab-2b2.
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