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nisa89
@nisa89
August 2022
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Помогите плиззз очень надо!!! Докажите равенство: (а + b + с)^2 = а^2 + 2ab + b^2 + 2аc + 2bс + с^2
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mikael2
(a+b+c)²=(a+b+c)*(a+b+c)=a²+ab+ac+ab+b²+bc+ac+bc+c²=
=a²+b²+c²+2(ab+ac+bc)
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nisa89
спасибо большое!!!!!!!
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=a²+b²+c²+2(ab+ac+bc)