x^2-(2k+3)x+k^2+3k+2
问题描述:
x^2-(2k+3)x+k^2+3k+2
答
x^2-(2k+3)x+k^2+3k+2
=x²-(2k+3)x+(k+2)(k+1)
=(x-k-1)(x-k-2)