(x+y)(x-y)(______)=x4-2x2y2+y4,(x+y)2=(x-y)2+______.
题型:填空题难度:一般来源:不详
(x+y)(x-y)(______)=x4-2x2y2+y4,(x+y)2=(x-y)2+______. |
答案
(x+y)(x-y)=x2-y2, x4-2x2y2+y4=(x2-y2)2; (x+y)2=(x2+2xy+y2-4xy)+4xy=(x-y)2+4xy 故填(x2-y2);4xy. |
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