(2a+3b)(a-2b)-(2b-a)(2a+3b).
问题描述:
(2a+3b)(a-2b)-(2b-a)(2a+3b).
答
原式=2a2-4ab+3ab-6b2-4ab-6b2+2a2+3ab=4a2-2ab-12b2.
(2a+3b)(a-2b)-(2b-a)(2a+3b).
原式=2a2-4ab+3ab-6b2-4ab-6b2+2a2+3ab=4a2-2ab-12b2.