问题
解答题
(3a+2b)2-(a-4b)2.
答案
(3a+2b)2-(a-4b)2
=[(3a+2b)+(a-4b)][(3a+2b)-(a-4b)]
=(4a-2b)(2a+6b)
=4(2a-b)(a+3b).
(3a+2b)2-(a-4b)2.
(3a+2b)2-(a-4b)2
=[(3a+2b)+(a-4b)][(3a+2b)-(a-4b)]
=(4a-2b)(2a+6b)
=4(2a-b)(a+3b).