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

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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
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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
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

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
1)3a-2a+4-3a^2+a.=-3a^2+2a
2)xy+2xy-3x^2-3xv+x^2.=-2x^2
3)5a^2b-3ab-4ab^2+7ab-2ab^2.=5a^2b+4ab-6ab^2
4)4-2xy+7xy-15+xy=-11+6xy