Question

你有一次回答，答案是像上面这样把二次三项式分解因式的数学方法是 添项 m^2-6m+8 =m^2-6m+9-9+8 =(m-3)^2-

像上面这样把二次三项式分解因式的数学方法是 添项

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

x^4+4
=x^4+4x^2+4-4x^2
=(x^2+2)^2-(2x)^2
=(x^2+2x+2)(x^2-2x+2)

Answer 1

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

Answer 2

x^6+18x
=x^6+18x+81-81
=(x^3+9)^2-81
=(x^3+9+9)(x^3+9-9)
=(x^3+18)x^3
什么意思？？？

Answer 3

x^4+4
=x^4+4x^2+4-4x^2
=(x^2+2)^2-(2x)^2
=(x^2+2x+2)(x^2-2x+2)
？
问题呢？