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plakyshijrenat
@plakyshijrenat
July 2022
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Доказать,что если х+у=9,то
(х+1)(у+1)-(х-1)(у-1)=18
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spasibo3pajbrh
(х+1)(у+1)-(х-1)(у-1)=
=ху+у+х+1-(ху-у-х+1)=2(х+у)=2•9=18
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Answers & Comments
=ху+у+х+1-(ху-у-х+1)=2(х+у)=2•9=18