(a+b)[(a+b)2-3ab]-(a-b)[(a-b)2+3ab]=______.
题型:填空题难度:简单来源:不详
(a+b)[(a+b)2-3ab]-(a-b)[(a-b)2+3ab]=______. |
答案
(a+b)[(a+b)2-3ab]-(a-b)[(a-b)2+3ab], =(a+b)(a2+2ab+b2-3ab)-(a-b)(a2-2ab+b2+3ab), =(a+b)(a2-ab+b2)-(a-b)(a2+ab+b2), =a3+b3-a3+b3, =2b3. |
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