m^2-6m+8 分解因式用添项,拆项法做!有个例子：x^2+2ax-3a^2=x^2+2ax+a^2-a^2-3a^2=(x+_数学解答

m^2-6m+8 分解因式用添项,拆项法做!有个例子：x^2+2ax-3a^2=x^2+2ax+a^2-a^2-3a^2=(x+a)^2-(2a)^2=(x+
3a)(x-3a)

人气：431 ℃　时间：2020-05-25 11:31:55

解答

m²-6m+8
=m²-6m+9-1
=(m-3)²-1²
=(m-3+1)(m-3-1)
=(m-2)(m-4)