分解因式:(x+y-2xy)(x+y-2)+(xy-1)²
分解因式:(x+y-2xy)(x+y-2)+(xy-1)²??
参考答案:答案是
(x + y - 2xy)(x + y - 2) + (xy - 1)^2
= (xy - x - y + 1)^2
凑一凑就出来了。
(xy - x - y + 1)^2=(x-1)^2*(y-1)^2
因为:xy - x - y + 1=(x-1)*(y-1)
分解因式:(x+y-2xy)(x+y-2)+(xy-1)²??
参考答案:答案是
(x + y - 2xy)(x + y - 2) + (xy - 1)^2
= (xy - x - y + 1)^2
凑一凑就出来了。
(xy - x - y + 1)^2=(x-1)^2*(y-1)^2
因为:xy - x - y + 1=(x-1)*(y-1)