网址:http://m.1010jiajiao.com/timu3_id_602455[举报]
简化下列各式:
①
②
化简下列各式:
(1)4a2-3b2+2ab-4a2-3b2+5ba.
(2)5xy+3y2-3x2-xy+4xy+2x2-x2+3y2.