(m²-m)(m²-m+1)-26
=(m²-m)²+(m²-n)-26
=(m²-m)²+(m²-n)+1/4-1/4-26
=(m²-m+1/2)²-105/4
=(m²-m+1/2)²-(√105/2)²
=(m²-m+1/2+√105/2)(m²-m+1/2-√105/2)
题目有误吗?我问同学抄的题目，也不知道对不对就先采纳你的吧好像应该是(m²-m)(m²-m+1)-20 =(m²-m)²+(m²-n)-20 =(m²-m+5)(m²-m-4)