X^4+81/4
解:原式=(x^2)^2+(9/2)^2
=[(x^2)^2+(9/2)^2+9x^2]-9x^2
=(x^2+9/2)^2-(3x)^2
=(x^2+9/2-3x)(x^2+9/2+3x)
^---------代表什么?
x^4+81/4
=(x^2)^2+(9/2)^2
=[(x^2)^2+(9/2)^2+9x^2]-9x^2
=(x^2+9/2)^2-(3x)^2
=(x^2+9/2-3x)(x^2+9/2+3x)
考虑虚数吗?
X^4+81/4
=(x*x+9/2)^2-9x*x
=(x*x+3x+9/2)(x*x-3x+9/2)
X^4+81/4
原式=(x^2)^2+(9/2)^2
=[(x^2)^2+(9/2)^2+9x^2]-9x^2
=(x^2+9/2)^2-(3x)^2
=(x^2+9/2-3x)(x^2+9/2+3x)