﹙m²＋2m﹚²－2m²－4m+1因式分解

﹙m²＋2m﹚²－2m²－4m+1因式分解
﹙m²＋2m﹚²－2m²－4m+1因式分解

﹙m²＋2m﹚²－2m²－4m+1因式分解
上式可以化简为﹙m²＋2m﹚²-2（m²＋2m）+1
令m²＋2m=t
所以式子就是（t-1）²
将m²＋2m=t代入