因式分解25a^2 x^2-16a^2-a^2 y^2+8a^2 y
问题描述:
因式分解25a^2 x^2-16a^2-a^2 y^2+8a^2 y
答
25a^2x^2-16a^2-a^2y^2+8a^2 y
=a^2(25x^2-1)-a^2(y^2-8y)
=a^2(5x+1)(5x-1)-a^2(y^2-8y)
=a^2[(5x+1)(5x-1)-y(y-8)]