因式分解x^2-9x^2y^2+6xy-1
问题描述:
因式分解x^2-9x^2y^2+6xy-1
答
x^2-9x^2y^2+6xy-1
=x^2-(9x^2y^2-6xy+1)
=x^2-(3xy-1)^2
=(x+3xy-1)(x-3xy+1)