1.计算:(m+1)²(m-1)²
=(m²-1)²
=m^4-2m²+1
2.计算:(a-2b+1)²
=(a-2b)²+2(a-2b)+1
=a²-4ab+4b²+2a-4b+1第一题的结果我看不懂。。能清楚点吗？:(m+1)²(m-1)² =[(m+1)(m-1)]² =(m²-1)²