помогите! упростите выражение: -3a^5 b^2 ⋅ (7a^3)^2 =
варианты ответов:
1)21a^11 b^2
2)-147a^11 b^2
3)-21a^10 b^2
4)147a^10 b^2                (^5 - степень)  

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