合并同类项:1)3a-2a+4-3a^2+a.2)xy+2xy-3x^2-3xv+x^2.3)5a^2b-3ab-4ab^2+7ab-2ab^2.4)4-2xy+7xy-15+xy
问题描述:
合并同类项:1)3a-2a+4-3a^2+a.2)xy+2xy-3x^2-3xv+x^2.3)5a^2b-3ab-4ab^2+7ab-2ab^2.4)4-2xy+7xy-15+xy
答
合并同类项:1)3a-2a+4-3a^2+a.2)xy+2xy-3x^2-3xv+x^2.3)5a^2b-3ab-4ab^2+7ab-2ab^2.4)4-2xy+7xy-15+xy