Автор - jsjsjw7

помогите пожалуйста takushnir​

Ответ

Автор - takushnir

к³-r²к-rк²+r³=(r³+к³)-rк*(r+к)=(r+к)(r²-rк+к²)-(rк)(r+к)=(r+к)*(r²-2rк+к²)=

(r-к)²*(r+к)

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