分解因式:﹙xy-1﹚²+﹙x+y-2﹚﹙x+y-2xy﹚
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分解因式:﹙xy-1﹚²+﹙x+y-2﹚﹙x+y-2xy﹚
分解因式:﹙xy-1﹚²+﹙x+y-2﹚﹙x+y-2xy﹚
分解因式:﹙xy-1﹚²+﹙x+y-2﹚﹙x+y-2xy﹚
原式
=x^2y^2-2xy+1 +(x+y)^2-2(1+xy)(x+y)+4xy
=(x+y)^2-2(1+xy)(x+y)+(1+xy)^2
=(x+y)^2-(1+xy)(x+y)-(1+xy)(x+y)+(1+xy)^2
=(x+y)(x+y-1-xy)-(1+xy)(x+y-1-xy)
=(x+y-1-xy)(x+y-1-xy)
=(x+y-1-xy)^2
遇到这种有x+y和xy的式子,常用换元法。