X的4次冪減6X的2次冪Y的2次冪加8Y的4次冪
=x^4-6x^2y^2+8y^4
=(x²-2y²)(x²-4y²)
=(x²-2y²)(x-2y)(x+2y)正么寫老師說不對(duì)如果是實(shí)數(shù)范圍內(nèi)分解因式，就等于以下=（x-y√2)(x+y√2)(x-2y)(x+2y)就分X的2次冪減2Y的2次冪x²-2y²=(x-y√2)(x+y√2)對(duì)號(hào)什么意思√2 是根號(hào)2的意思根號(hào)什么意思根號(hào)2乘以根號(hào)2=2在書寫時(shí)根號(hào)怎么表示