探究
计算下列各式，你能发现什么？ (p+1)2 =(p+1)(p+1)= (m+2)2= (p-1)2 =(p-1)(p-1)= (m-2)2 =
p2+2p+1
(m+2)(m+2)=m2+4m+4
p2-2p+1
(m-2)(m-2)=m2- 4m+4
