x4次方-5x的平方+4分解因式

问题描述:

x4次方-5x的平方+4分解因式

先十字相乘
x^4-5x²+4
=(x^2-1)(x^2-4)
再平方差
=(x-1)(x+1)(x-2)(x+2)

x~4-5x~2+4
=x~4-2*2.5x~2+2.5~2-6.25+4
=(x~2-2.5)~2-2.25
=(x~2-2.5)~2-1.5~2
=(x~2-2.5-1.5)(x~2-2.5+1.5)
=(x~2-4)(x~2-1)
=(x-2)(x+2)(x-1)(x+1)

x^4-5x²+4
= x^4-4x²+4-x²
=(x²-2)²-x²
=(x²-x-2)(x²+x-2)
=(x-2)(x+1)(x+2)(x-1)

x4次方-5x的平方+4
=(x²+1)(x²-1)
=(x²+1)(x+1)(x-1)