因式分解1)-4x^2+1 2)(m^2+n^2)^2-4m^2n^2

问题描述:

因式分解1)-4x^2+1 2)(m^2+n^2)^2-4m^2n^2

1. -4x^2+1=1-4x^2=(1+2x)(1-2x)
2. (m^2+n^2)^2-4m^2n^2
=(m^2+n^2+2mn)(m^2+n^2-2mn)
=(m+n)^2 * (m-n)^2