(1)(m^2+n^2)^2-4m^2n^2 (2)a^2-b^2-2b-1

问题描述:

(1)(m^2+n^2)^2-4m^2n^2 (2)a^2-b^2-2b-1

(m^2+n^2)^2-4m^2n^2
=m^4+2m^2n^2+n^4-4m^2n^2
=m^4-2m^2n^2+n^4
=(m^2-n^2)^2
a^2-b^2-2b-1
=a^2-(b^2+2b+1)
=a^2-(b+1)^2
=(a+b+1)(a-b-1)

(1)(m^2+n^2)^2-4m^2n^2 =(m^2+n^2)^2-(2mn)^2=(m^2+2mn+n^2)(m^2-2mn+n^2)=(m+n)^2*(m-n)^2
(2) a^2-b^2-2b-1=(a+1)(a-1)-b(b+2)

life佳惠您好,解题如下:
(1)(m^2+n^2)^2-4m^2n^2
=m^4+2m^2n^2+n^4-4m^2n^2
=m^4-2m^2n^2+n^4
=(m^2-n^2)^2
=(m+n)^2(m-n)^2
(2)a^2-b^2-2b-1
=a^2-(b^2+2b+1)
=a^2-(b+1)^2
=(a+b+1)(a-b-1)
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