(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
答
(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)
答
(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)
答
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)
如果您有不懂的地方,如果觉得没问题,别忘了采纳答案哦!