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Maririna00
@Maririna00
July 2022
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Преобразить в многочлен стандартного вида:
(3а-7в)(9а+21в)
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oppression
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(3a-7b)(9a+21b)=27a²+63ab-63ab-147b²=27a²-147b².
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SergFlint
Проще по формуле разности квадратов: (3a-7b)(9a+21b)=3(3a-7b)(3a+7b)=3(9a²-49b²)=27a²-147b²
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(3a-7b)(9a+21b)=27a²+63ab-63ab-147b²=27a²-147b².