=(x+y-2xy)(x+y-2)+(1-xy)^2
=(x+y)^2-2(1+xy)(x+y)+4xy+1-2xy+x^2y^2
=(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
第二题- -后面是不是激圆还漏了个耐铅销+12或者+37或者+别的- -
原式=(2x^2-5x+2)(6x^2-13x+6)
=(x-2)(2x-1)(2x-3)(3x-2)
思路么我昌游是直接分解成(ax^2+bx+a)(cx^2+dx+c)....
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