题目内容
(2a-b2)(2a+b2)=________
4a2-b4
A.a2+2ab+b2-2a-2b+1=(a2-2a+1)+(b2-2b+2ab)
B.a2+2ab+b2-2a-2b+1=(a2+2ab+b2)-2(a+b)+1
C.a2+2ab+b2-2a-2b+1=(b2-2b+1)+2ab+(a2-2a)
D.a2+2ab+b2-2a-2b+1=(a2+b2)-2(a+b-ab)+1