x²+6XY+9Y²-2X-6Y+1因式分解
问题描述:
x²+6XY+9Y²-2X-6Y+1因式分解
答
x²+6XY+9Y²-2X-6Y+1
=(x+3y)²-2(x+3y)+1
=(x+3y-1)²