Ответ: 1)3a^2b-ab^2
2)2x^2+x-3
3)19a-8b-3c-6d
4)-a^4+7a^2b^2-3ab^3
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Ответ: 1)3a^2b-ab^2
2)2x^2+x-3
3)19a-8b-3c-6d
4)-a^4+7a^2b^2-3ab^3