-4x^2+81.因式分解
问题描述:
-4x^2+81.因式分解
答
-4x^2+81
=9²-(2x)²
=(9+2x)(9-2x)
-4x^2+81.因式分解
-4x^2+81
=9²-(2x)²
=(9+2x)(9-2x)