计算:(m+1/2n)(-m+1/2n)

问题描述:

计算:(m+1/2n)(-m+1/2n)

(m+1/2n)(-m+1/2n)
=(1/2n+m)(1/2n-m)
=1/4n²-m²

(m+1/2n)(-m+1/2n)

=-(m+1/2n)(m-1/2n)
=-(m^2-1/4n^2)
=-m^2+1/4n^2

如果帮到你,请记得采纳,O(∩_∩)O谢谢

ljx乖囧猫:
(m+1/2n)(-m+1/2n)改变成(a+b)(a-b)的形式
=(1/2n+m)(1/2n-m)
=1/4n²-m²
祝好,再见.