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robben22
@robben22
October 2021
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Примените формула сокращенного умножения (-7+2у)^2
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nukalka
Это будет формула квадрат суммы: (a+b)²=a²+2ab+b², применяем к нашему выражению.
(-7+2у)²=(-7)²+2*(-7)*2у+(2у)²=49-28у+4у². Удачи!
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Answers & Comments
(-7+2у)²=(-7)²+2*(-7)*2у+(2у)²=49-28у+4у². Удачи!