分解因式:﹙xy-1﹚²+﹙x+y-2﹚﹙x+y-2xy﹚
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 00:20:30
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-2x
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。