网址：http://m.1010jiajiao.com/timu3_id_599247[举报]
(2a－3b)(2a＋3b)＝________．
(2a－b2)(2a＋b2)＝________
(2a－b)2＋(________)＝4a2＋b2
(2a－b)(－2a－b)＝________，(4x－3y)(3y－4x)＝________．