问题标题:
(1)(a-0.5)^2(a+0.5)^2(2)因式分解3x^2-7x+2(3)(m^2+n^2)^2-4m^2n^2
问题描述:

(1)(a-0.5)^2(a+0.5)^2(2)因式分解3x^2-7x+2(3)(m^2+n^2)^2-4m^2n^2

康烁回答:
  (1)(a-0.5)^2(a+0.5)^2   =[(a-0.5)(a+0.5)]^2   =(a^2-0.25)^2   =a^4-0.5a^2+0.0625   (2)因式分解   3x^2-7x+2   =(3x-1)*(x-2)   (3)(m^2+n^2)^2-4m^2n^2   =[(m^2+n^2)+2mn][(m^2+n^2)-2mn]   =(m+n)^2*(m-n)^2
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