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Anastasia27mrmrmr
@Anastasia27mrmrmr
October 2021
1
20
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(х-3у)(3у-х)-(3у-2х)²
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AlexMam
(х-3у)(3у-х)-(3у-2х)²=(-3y+x)(3у-х)-(3у-2х)²=-(3y-x)(3y-x)-(3y-2x)²=-(3y-x)²-(3y-2x)²=-((9y²-6xy+x²)+(9y²-12xy+x²))=-(18y²-18xy+x²)=-18y²+18xy-x²
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