x^2-2x+1-k(x^2-1) 因式分解

问题描述:

x^2-2x+1-k(x^2-1) 因式分解
结果不能带中括号

x^2-2x+1-k(x^2-1)
=(x-1)²-k(x+1)(x-1)
=(x-1)[x-1-k(x+1)]
=(x-1)(x-kx-k-1)