因式分解ax^2+ay^2-az^2-2axy
问题描述：
因式分解ax^2+ay^2-az^2-2axy
答
ax^2+ay^2-az^2-2axy
=a[(x^2+y^2-2xy)-z^2]
=a[(x-y)^2-z^2]
=a(x-y+z)(x-y-z)